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 Ionization (11)
 Impact Ionization (5)
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 Atoms (5)
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 Electron ImpactIonization (4)
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Articles 1  30 of 40
FullText Articles in Physical Sciences and Mathematics
Control Of Mesoscopic Transport By Modifying Transmission Channels In Opaque Media, Raktim Sarma, Alexey Yamilov, Seng Fatt Liew, Mikhael Guy, Hui Cao
Control Of Mesoscopic Transport By Modifying Transmission Channels In Opaque Media, Raktim Sarma, Alexey Yamilov, Seng Fatt Liew, Mikhael Guy, Hui Cao
Physics Faculty Research & Creative Works
While controlling particle diffusion in a confined geometry is a popular approach taken by both natural and artificial systems, it has not been widely adopted for controlling light transport in random media, where wave interference effects play a critical role. The transmission eigenchannels determine not only light propagation through the disordered system but also the energy concentrated inside. Here, we propose and demonstrate an effective approach to modify these channels, whose structures are considered to be universal in conventional diffusive waveguides. By adjusting the waveguide geometry, we are able to alter the spatial profiles of the transmission eigenchannels significantly and ...
Using Geometry To Manipulate LongRange Correlation Of Light Inside Disordered Media, Raktim Sarma, Alexey Yamilov, Pauf Neupane, Hui Cao
Using Geometry To Manipulate LongRange Correlation Of Light Inside Disordered Media, Raktim Sarma, Alexey Yamilov, Pauf Neupane, Hui Cao
Physics Faculty Research & Creative Works
We demonstrate an effective approach of modifying the longrange spatial correlation for light propagating inside random photonic waveguides by varying the shape of the waveguide. The functional form of spatial correlation is no longer universal in the regime of diffusive transport and becomes shape dependent due to the nonlocal nature of wave propagation. The spatial dependence of the correlation may become asymmetric for light incident from opposite ends of the waveguide. This work opens the door to control nonlocal effects in mesoscopic transport of waves by tailoring the geometry of random systems. .
Bounds On Large Extra Dimensions From The Simulation Of Black Hole Events At The Lhc, Shaoqi Hou, Benjamin Harms, Marco Cavaglia
Bounds On Large Extra Dimensions From The Simulation Of Black Hole Events At The Lhc, Shaoqi Hou, Benjamin Harms, Marco Cavaglia
Physics Faculty Research & Creative Works
If large extra dimensions exist, the Planck scale may be as low as a TeV and microscopic black holes may be produced in highenergy particle collisions at this energy scale. We simulate microscopic black hole formation at the Large Hadron Collider and compare the simulation results with recent experimental data by the Compact Muon Solenoid collaboration. The absence of observed black hole events in the experimental data allows us to set lower bounds on the Planck scale and various parameters related to microscopic black hole formation for a number (3 − 6) of extra dimensions. Our analysis sets lower bounds on ...
InfiniteNoise Criticality: Nonequilibrium Phase Transitions In Fluctuating Environments, Thomas Vojta, José A. Hoyos
InfiniteNoise Criticality: Nonequilibrium Phase Transitions In Fluctuating Environments, Thomas Vojta, José A. Hoyos
Physics Faculty Research & Creative Works
We study the effects of timevarying environmental noise on nonequilibrium phase transitions in spreading and growth processes. Using the examples of the logistic evolution equation as well as the contact process, we show that such temporal disorder gives rise to a distinct type of critical points at which the effective noise amplitude diverges on long time scales. This leads to enormous density fluctuations characterized by an infinitely broad probability distribution at criticality. We develop a realtime renormalizationgroup theory that provides a general framework for the effects of temporal disorder on nonequilibrium processes. We also discuss how general this exotic critical ...
The Stripe 82 Massive Galaxy Project. I. Catalog Construction, Kevin Bundy, Alexie Leauthaud, Shun Saito, For Full List Of Authors, See Publisher's Website.
The Stripe 82 Massive Galaxy Project. I. Catalog Construction, Kevin Bundy, Alexie Leauthaud, Shun Saito, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
The Stripe 82 Massive Galaxy Catalog (S82MGC) is the largestvolume stellar masslimited sample of galaxies beyond z ≈ 0.1 constructed to date. Spanning 139.4 deg^{2}, the S82MGC includes a masslimited sample of 41,770 galaxies with log M_{*}/M_{⊙} ≳ 11.2 to z ≈ 0.7, sampling a volume of 0.3 Gpc^{3}, roughly equivalent to the volume of the Sloan Digital Sky SurveyI/II (SDSSI/II) z < 0.15 main sample. The catalog is built on three pillars of survey data: the SDSS Stripe 82 Coadd photometry which reaches rband magnitudes of ∼23.5 AB, Y JHK photometry at depths of 20th magnitude (AB) from the UK Infrared Deep Sky Survey Large Area Survey, and over 70,000 spectroscopic galaxy redshifts from the SDSSI/II and the Baryon Oscillation Spectroscopic Survey. We describe the catalog construction and verification, the production of 9band matched aperture photometry, tests of existing and newly estimated photometric redshifts required to supplement spectroscopic redshifts for 55% of the log M_{*}/M_{⊙} ≳ 11.2 sample, and geometric masking. We provide nearIR based stellar mass estimates and compare these to previous estimates. All catalog products are made publicly available. The S82MGC not ...
Comparison Of Experimental And Theoretical ElectronImpactIonization TripleDifferential Cross Sections For Ethane, Esam Ali, Kate Nixon, Andrw Murray, Chuangang Ning, James Colgan, Don H. Madison
Comparison Of Experimental And Theoretical ElectronImpactIonization TripleDifferential Cross Sections For Ethane, Esam Ali, Kate Nixon, Andrw Murray, Chuangang Ning, James Colgan, Don H. Madison
Physics Faculty Research & Creative Works
We have recently examined electronimpact ionization of molecules that have one large atom at the center, surrounded by H nuclei (H_{2}O, NH_{3}, CH_{4}). All of these molecules have ten electrons; however, they vary in their molecular symmetry. We found that the tripledifferential cross sections (TDCSs) for the highest occupied molecular orbitals (HOMOs) were similar, as was the character of the HOMO orbitals which had a ptype "peanut" shape. In this work, we examine ethane (C_{2}H_{6}) which is a molecule that has two large atoms surrounded by H nuclei, so that its HOMO has ...
Reconstruction Of TwoDimensional Molecular Structure With LaserInduced Electron Diffraction From LaserAligned Polyatomic Molecules, Chao Yu, Hui Wei, Xu Wang, AnhThu Le, Ruifeng Lu, C. D. Lin
Reconstruction Of TwoDimensional Molecular Structure With LaserInduced Electron Diffraction From LaserAligned Polyatomic Molecules, Chao Yu, Hui Wei, Xu Wang, AnhThu Le, Ruifeng Lu, C. D. Lin
Physics Faculty Research & Creative Works
Imaging the transient process of molecules has been a basic way to investigate photochemical reactions and dynamics. Based on laserinduced electron diffraction and partial onedimensional molecular alignment, here we provide two effective methods for reconstructing twodimensional structure of polyatomic molecules. We demonstrate that electron diffraction images in both scattering angles and broadband energy can be utilized to retrieve complementary structure information, including positions of light atoms. With picometre spatial resolution and the inherent femtosecond temporal resolution of lasers, laserinduced electron diffraction method offers significant opportunities for probing atomic motion in a large molecule in a typical pumpprobe measurement.
Polyatomic Molecular Structure Retrieval Using LaserInduced Electron Diffraction, Michael G. Pullen, Benjamin Wolter, AnhThu Le, Matthias Baudisch, Michael Hemmer, Arne Senftleben, M. Sclafani, Claus Dieter Schroeter, Joachim Ullrich, Robert Moshammer, C. D. Lin, Jens Biegert
Polyatomic Molecular Structure Retrieval Using LaserInduced Electron Diffraction, Michael G. Pullen, Benjamin Wolter, AnhThu Le, Matthias Baudisch, Michael Hemmer, Arne Senftleben, M. Sclafani, Claus Dieter Schroeter, Joachim Ullrich, Robert Moshammer, C. D. Lin, Jens Biegert
Physics Faculty Research & Creative Works
Laserinduced electron diffraction is a developing dynamical imaging technique that is already able to probe molecular dynamics at fewfemtosecond temporal resolutions and has the potential to reach the subfemtosecond level. Here we provide the recipe for the extension of the technique to polyatomic molecules and we demonstrate the method by extracting the structure of aligned and antialigned acetylene (C₂H₂). We show that multiple bond lengths can be simultaneously imaged at high accuracy including elusive hydrogen containing bonds. Our results open the door to the investigation of larger complex molecules and the realization of a true molecular movie.
LowEnergy (E₀ = 65 Ev) ElectronImpact Ionization Of Neon: Internormalized TripleDifferentical Cross Sections In 3d Kinematics, Xueguang Ren, Sadek M. Amami, Oleg I. Zatsarinny, Thomas Pfluger, Marvin Weyland, Woon Yong Baek, Hans Rabus, Klaus Bartschat, Don H. Madison, Alexander Dorn
LowEnergy (E₀ = 65 Ev) ElectronImpact Ionization Of Neon: Internormalized TripleDifferentical Cross Sections In 3d Kinematics, Xueguang Ren, Sadek M. Amami, Oleg I. Zatsarinny, Thomas Pfluger, Marvin Weyland, Woon Yong Baek, Hans Rabus, Klaus Bartschat, Don H. Madison, Alexander Dorn
Physics Faculty Research & Creative Works
We present a combined experimental and theoretical study on the lowenergy (E_{0} = 65 eV) electron impact ionization of neon. The experimental data are compared to predictions from a hybrid secondorder distortedwave Born plus Rmatrix approach (DWB2RM), the distortedwave Born approximation with inclusion of postcollision interaction (DWBAPCI), a threebody distortedwave approach (3DW), and a Bspline Rmatrix (BSR) with pseudostates approach. Excellent agreement is found between experiment and the 3DW and BSR theories. The importance of PCI effects is clearly visible in this lowenergy electronimpact ionization process.
Theoretical And Experimental Study Of (E,2e) Ionization Of The Co₂ (1Π_{G}) Molecule At 250 Ev, Mevlut Dogan, Zehra Nur Ozer, Murat Yavuz, Osman Alwan, Adnan Naja, Boghos B. Joulakian, Esam S M Ali, Chuangang Ning, Don H. Madison
Theoretical And Experimental Study Of (E,2e) Ionization Of The Co₂ (1ΠG) Molecule At 250 Ev, Mevlut Dogan, Zehra Nur Ozer, Murat Yavuz, Osman Alwan, Adnan Naja, Boghos B. Joulakian, Esam S M Ali, Chuangang Ning, Don H. Madison
Physics Faculty Research & Creative Works
Triple differential cross sections (TDCSs) of the electronimpact ionization of carbon dioxide are measured in the coplanar asymmetric geometry, with incident electron energy value of 250eV, and ejected electron of 37eV. We will report the experimental results in comparison with the theoretical calculations of the M3DW and TCC (type 5) calculations.
Evidence For UnnaturalParity Contributions To ElectronImpact Ionization Of LaserAligned Atoms, G. S. J. Armstrong, J. Colgan, M. S. Pindzola, S. Amami, Don H. Madison, J. Pursehouse, K. L. Nixon, A. J. Murray
Evidence For UnnaturalParity Contributions To ElectronImpact Ionization Of LaserAligned Atoms, G. S. J. Armstrong, J. Colgan, M. S. Pindzola, S. Amami, Don H. Madison, J. Pursehouse, K. L. Nixon, A. J. Murray
Physics Faculty Research & Creative Works
Recent measurements have examined the electronimpact ionization of excitedstate laseraligned Mg atoms. In this work we show that the ionization cross section arising from the geometry where the aligned atom is perpendicular to the scattering plane directly probes the unnatural parity contributions to the ionization amplitude. The contributions from natural parity partial waves cancel exactly in this geometry. Our calculations resolve the discrepancy between the nonzero measured cross sections in this plane and the zero cross section predicted by distortedwave approaches. We demonstrate that this is a general feature of ionization from pstate targets by additional studies of ionization from ...
Coplanar Asymmetric Angles And Symmetric Energy Sharing Triple Differential Cross Sections For 200 Ev ElectronImpact Ionization Of Ar (3p), Zehra Nur Ozer, Sadek M. Amami, Onur Varol, Murat Yavuz, Mevlut Dogan, Don H. Madison
Coplanar Asymmetric Angles And Symmetric Energy Sharing Triple Differential Cross Sections For 200 Ev ElectronImpact Ionization Of Ar (3p), Zehra Nur Ozer, Sadek M. Amami, Onur Varol, Murat Yavuz, Mevlut Dogan, Don H. Madison
Physics Faculty Research & Creative Works
We have measured triple differential cross sections (TDCSs) for electronimpact ionization of the 3p shell of Ar at 200 eV incident electron energy. The experiments have been performed in coplanar asymmetric energy sharing geometry. The experimental results are compared with the theoretical models of three body distorted wave (3DW) and distorted wave Born approximation (DWBA).
First Evidence Of Interference Effects In The Ionization Of N₂ Molecule, Zehra Nur Ozer, Hari Chaluvadi, Mevlut Dogan, James Colgan, Don H. Madison
First Evidence Of Interference Effects In The Ionization Of N₂ Molecule, Zehra Nur Ozer, Hari Chaluvadi, Mevlut Dogan, James Colgan, Don H. Madison
Physics Faculty Research & Creative Works
We will present an experimental and theoretical investigation of triple differential cross sections for electron impact ionization of nitrogen molecules at intermediate energies. A discussion of interference effects contained in the theoretical and experimental interference factors will be presented.
Anharmonic Properties In Mg₂X (X= C, Si, Ge, Sn, Pb) From FirstPrinciples Calculations, Aleksandr V. Chernatynskiy, Simon R. Phillpot
Anharmonic Properties In Mg₂X (X= C, Si, Ge, Sn, Pb) From FirstPrinciples Calculations, Aleksandr V. Chernatynskiy, Simon R. Phillpot
Physics Faculty Research & Creative Works
Thermal conductivity reduction is one of the potential routes to improve the performance of thermoelectric materials. However, detailed understanding of the thermal transport of many promising materials is still missing. In this paper, we employ electronicstructure calculations at the level of density functional theory to elucidate thermal transport properties of the Mg_{2}X (X=C, Si, Ge, Sn, and Pb) family of compounds, which includes Mg_{2}Si, a material already identified as a potential thermoelectric. All these materials crystallize into the same antifluorite structure. Systematic trends in the anharmonic properties of these materials are presented and examined. Our ...
Muonic Bound Systems, Virtual Particles, And Proton Radius, Ulrich D. Jentschura
Muonic Bound Systems, Virtual Particles, And Proton Radius, Ulrich D. Jentschura
Physics Faculty Research & Creative Works
The proton radius puzzle questions the selfconsistency of theory and experiment in light muonic and electronic bound systems. Here we summarize the current status of virtual particle models as well as Lorentzviolating models that have been proposed in order to explain the discrepancy. Highly charged oneelectron ions and muonic bound systems have been used as probes of the strongest electromagnetic fields achievable in the laboratory. The average electric field seen by a muon orbiting a proton is comparable to hydrogenlike uranium and, notably, larger than the electric field in the most advanced stronglaser facilities. Effective interactions due to virtual annihilation ...
Interference Effects For Intermediate Energy ElectronImpact Ionization Of H₂ And N₂ Molecules, Zehra Nur Ozer, Hari Chaluvadi, Don H. Madison, Mevlut Dogan
Interference Effects For Intermediate Energy ElectronImpact Ionization Of H₂ And N₂ Molecules, Zehra Nur Ozer, Hari Chaluvadi, Don H. Madison, Mevlut Dogan
Physics Faculty Research & Creative Works
We have studied electron impact ionization of H_{2} and N_{2} molecules at intermediate energies to look for possible two center interference effects experimentally and theoretically. Here we report a study of the interference factor I for 250 eV electronimpact ionization. The experimental measurements are performed using a crossedbeamtype electronelectron coincidence spectrometer and theoretical calculations are obtained using the Molecular Three Body Distorted Wave Approximation (M3DW). We found that the Ifactor demonstrated strong evidence for twocenter interference effects for both H_{2} and N_{2}. We also found that the Ifactor is more sensitive to projectile angular scans than ...
Applicability Of The PositionDependent Diffusion Approach To Localized Transport Through Disordered Waveguides, Pauf Neupane, Alexey Yamilov
Applicability Of The PositionDependent Diffusion Approach To Localized Transport Through Disordered Waveguides, Pauf Neupane, Alexey Yamilov
Physics Faculty Research & Creative Works
In this work we show analytically and numerically that the localized regime of wave transport can be modeled as positiondependent diffusion with a diffusion coefficient that retains the memory of the source location. The dependence on the source diminishes when absorption is introduced.
Erratum: LowEnergy ElectronImpact Ionization Of Argon: ThreeDimensional Cross Section (Physical Review A  Atomic, Molecular, And Optical Physics 85, 032702 (2012)), Xueguang Ren, Thomas Pfluger, Joachim Hermann Ullrich, Oleg I. Zatsarinny, Klaus Bartschat, Don H. Madison, Alexander Dorn
Erratum: LowEnergy ElectronImpact Ionization Of Argon: ThreeDimensional Cross Section (Physical Review A  Atomic, Molecular, And Optical Physics 85, 032702 (2012)), Xueguang Ren, Thomas Pfluger, Joachim Hermann Ullrich, Oleg I. Zatsarinny, Klaus Bartschat, Don H. Madison, Alexander Dorn
Physics Faculty Research & Creative Works
No abstract provided.
Ultrarelativistic Decoupling Transformation For Generalized Dirac Equations, J. H. Noble, Ulrich D. Jentschura
Ultrarelativistic Decoupling Transformation For Generalized Dirac Equations, J. H. Noble, Ulrich D. Jentschura
Physics Faculty Research & Creative Works
The FoldyWouthuysen transformation is known to uncover the nonrelativistic limit of a generalized Dirac Hamiltonian, lending an intuitive physical interpretation to the effective operators within Schrö dingerPauli theory. We here discuss the opposite, ultrarelativistic limit which requires the use of a fundamentally different expansion where the leading kinetic term in the Dirac equation is perturbed by the mass of the particle and other interaction (potential) terms, rather than vice versa. The ultrarelativistic decoupling transformation is applied to free Dirac particles (in the Weyl basis) and to highenergy tachyons, which are fasterthanlight particles described by a fully Lorentzcovariant equation. The effective ...
Emerging Criticality In The Disordered ThreeColor AshkinTeller Model, Qiong Zhu, Xin Wan, Rajesh Narayanan, José A. Hoyos, Thomas Vojta
Emerging Criticality In The Disordered ThreeColor AshkinTeller Model, Qiong Zhu, Xin Wan, Rajesh Narayanan, José A. Hoyos, Thomas Vojta
Physics Faculty Research & Creative Works
We study the effects of quenched disorder on the firstorder phase transition in the twodimensional threecolor AshkinTeller model by means of largescale Monte Carlo simulations. We demonstrate that the firstorder phase transition is rounded by the disorder and turns into a continuous one. Using a careful finitesizescaling analysis, we provide strong evidence for the emerging critical behavior of the disordered AshkinTeller model to be in the clean twodimensional Ising universality class, accompanied by universal logarithmic corrections. This agrees with perturbative renormalizationgroup predictions by Cardy. As a byproduct, we also provide support for the stronguniversality scenario for the critical behavior of ...
Imaging An Aligned Polyatomic Molecule With LaserInduced Electron Diffraction, Michael G. Pullen, Benjamin Wolter, AnhThu Le, Matthias Baudisch, Michael Hemmer, Arne Senftleben, Claus Dieter Schroeter, Joachim Ullrich, Robert Moshammer, C. D. Lin, Jens Biegert
Imaging An Aligned Polyatomic Molecule With LaserInduced Electron Diffraction, Michael G. Pullen, Benjamin Wolter, AnhThu Le, Matthias Baudisch, Michael Hemmer, Arne Senftleben, Claus Dieter Schroeter, Joachim Ullrich, Robert Moshammer, C. D. Lin, Jens Biegert
Physics Faculty Research & Creative Works
Laserinduced electron diffraction is an evolving tabletop method that aims to image ultrafast structural changes in gasphase polyatomic molecules with subÅngström spatial and femtosecond temporal resolutions. Here we demonstrate the retrieval of multiple bond lengths from a polyatomic molecule by simultaneously measuring the CC and CH bond lengths in aligned acetylene. Our approach takes the method beyond the hitherto achieved imaging of simple diatomic molecules and is based on the combination of a 160kHz midinfrared fewcycle laser source with full threedimensional electronion coincidence detection. Our technique provides an accessible and robust route towards imaging ultrafast processes in complex gasphase molecules ...
Erratum: Theoretical And Experimental (E,2e) Study Of ElectronImpact Ionization Of LaserAligned Mg Atoms [Physical Review A 90, 062707 (2014)], Sadek Amami, Andrew J. Murray, Al Stauffer, Kate Nixon, Gregory Armstrong, James Colgan, Don H. Madison
Erratum: Theoretical And Experimental (E,2e) Study Of ElectronImpact Ionization Of LaserAligned Mg Atoms [Physical Review A 90, 062707 (2014)], Sadek Amami, Andrew J. Murray, Al Stauffer, Kate Nixon, Gregory Armstrong, James Colgan, Don H. Madison
Physics Faculty Research & Creative Works
We have recently reported a theoretical and experimental study of electronimpact ionization of laseraligned magnesium. Results were presented for both ionization of the ground state, as well as for laseraligned atoms in the 3p state. For ionization from the 3p state, theoretical results were presented using the distorted wave Born (DWBA) and threebody distorted wave (3DW) approximations. Unfortunately, after publication we learned that the theoretical results were incorrect due to one of the arrays in the computer code dimensioned too small. The figures affected by this error are Figs. 3–5 in the original paper. The present Figs ...
Critical States Embedded In The Continuum, Milan Koirala, Alexey Yamilov, A. Basiri, Yaron Bromberg, Hui Cao, Tsampikos Kottos
Critical States Embedded In The Continuum, Milan Koirala, Alexey Yamilov, A. Basiri, Yaron Bromberg, Hui Cao, Tsampikos Kottos
Physics Faculty Research & Creative Works
Weintroduce a class of critical states which are embedded in the continuum (CSC) of a onedimensional optical waveguide array with one nonHermitian defect. These states are on the verge of being fractal and have real propagation constants. They emerge at a phase transition which is driven by the imaginary refractive index of the defective waveguide and it is accompanied by a mode segregation which reveals analogies with the Dicke superradiance. Below this point the states are extended while above it they evolve to exponentially localized modes. An addition of a background gain or loss can turn these localized states into ...
Tunable Negative Permeability In A ThreeDimensional Superconducting Metamaterial, Cihan Kurter, T. Lan, L. Sarytchev, Steven Mark Anlage
Tunable Negative Permeability In A ThreeDimensional Superconducting Metamaterial, Cihan Kurter, T. Lan, L. Sarytchev, Steven Mark Anlage
Physics Faculty Research & Creative Works
We report on highly tunable radiofrequency (rf) characteristics of a lowloss and compact threedimensional (3D) metamaterial made of superconducting thinfilm spiral resonators. The rf transmission spectrum of a single element of the metamaterial shows a fundamental resonance peak at ~24.95 MHz that shifts to a 25% smaller frequency and becomes degenerate when a 3D array of such elements is created. The metamaterial shows an in situ tunable narrow frequency band in which the real part of the effective permeability is negative over a wide range of temperature. This narrow frequency band gradually possesses nearzero and positive values for the ...
Classical Description Of H(1s) And H* (N=2) For CrossSection Calculations Relevant To ChargeExchange Diagnostics, N. D. Cariatore, Sebastian Otranto, Ronald E. Olson
Classical Description Of H(1s) And H* (N=2) For CrossSection Calculations Relevant To ChargeExchange Diagnostics, N. D. Cariatore, Sebastian Otranto, Ronald E. Olson
Physics Faculty Research & Creative Works
In this work, we introduce a classical trajectory Monte Carlo (CTMC) methodology, specially conceived to provide a more accurate representation of chargeexchange processes between highly charged ions and H(1s) and H* (n=2). These processes are of particular relevance in power fusion reactor programs, for which chargeexchange spectroscopy has become a useful plasma diagnostics tool. To test the methodology, electroncapture reactions from these targets by C^{6+},N^{7+}, and O^{8+} are studied at impact energies in the 10150keV/amu range. Stateselective cross sections are contrasted with those predicted by the standard microcanonical formulation of the CTMC method ...
Target Electron Ionization In Li²⁺LLi Collisions: A MultiElectron Perspective, Maciej Dominik Piewanowski, Laszlo Gulyas, Marko W. Horbatsch, Johannes Goullon, Natalia Ferreira, Renate Hubele, Vitor L B D De Jesus, H. Lindenblatt, Katharina R. Schneider, Michael Schulz, Michael Schuricke, Z. Song, Shaofeng Zhang, Daniel Fischer, Tom Kirchner
Target Electron Ionization In Li²⁺LLi Collisions: A MultiElectron Perspective, Maciej Dominik Piewanowski, Laszlo Gulyas, Marko W. Horbatsch, Johannes Goullon, Natalia Ferreira, Renate Hubele, Vitor L B D De Jesus, H. Lindenblatt, Katharina R. Schneider, Michael Schulz, Michael Schuricke, Z. Song, Shaofeng Zhang, Daniel Fischer, Tom Kirchner
Physics Faculty Research & Creative Works
Target electron removal in Li^{2+}Li collisions at 2290 keV/amu is studied experimentally and theoretically for ground and excited lithium target configurations. It is shown that in outershell ionization a singleelectron process plays the dominant part. However, the Kshell ionization results are more difficult to interpret. According to our calculations, the process is shown to be strongly singleparticle like. On one hand, a high resemblance between theoretical singleparticle ionization and exclusive innershell ionization is demonstrated, and contributions from multielectron processes are found to be weak. On the other hand, it is indicated by the discrepancy between experimental and ...
Luminous Red Galaxies In Clusters: Central Occupation, Spatial Distributions And Miscentring, Hanako Hoshino, Alexie Leauthaud, Shun Saito, For Full List Of Authors, See Publisher's Website.
Luminous Red Galaxies In Clusters: Central Occupation, Spatial Distributions And Miscentring, Hanako Hoshino, Alexie Leauthaud, Shun Saito, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
Luminous red galaxies (LRG) from the Sloan Digital Sky Survey are among the best understood samples of galaxies and are employed in a broad range of cosmological studies. In this paper, we study how LRGs occupy massive haloes via counts in clusters and reveal several unexpected trends. Using the redsequence Matchedfilter Probabilistic Percolation (redMaPPer) cluster catalogue, we derive the central occupation of LRGs as a function richness. We show that clusters contain a significantly lower fraction of central LRGs than predicted from the twopoint correlation function. At halo masses of 10^{14.5} M_{⊙}, we find N_{cen} = 0.73 ...
Kinematically Complete Study Of LowEnergy ElectronImpact Ionization Of Neon: Internormalized Cross Sections In ThreeDimensional Kinematics, Xueguang Ren, Sadek Amami, Oleg Zatsarinny, Thomas Pflüger, Marvin Weyland, Woon Yong Baek, Hans Rabus, Klaus Bartschat, Don H. Madison, Alexander Dorn
Kinematically Complete Study Of LowEnergy ElectronImpact Ionization Of Neon: Internormalized Cross Sections In ThreeDimensional Kinematics, Xueguang Ren, Sadek Amami, Oleg Zatsarinny, Thomas Pflüger, Marvin Weyland, Woon Yong Baek, Hans Rabus, Klaus Bartschat, Don H. Madison, Alexander Dorn
Physics Faculty Research & Creative Works
Lowenergy (E_{0} 0=65eV) electronimpact single ionization of Ne (2p) has been investigated to thoroughly test stateoftheart theoretical approaches. The experimental data were measured using a reaction microscope, which can cover nearly the entire 4π solid angle for the secondary electron emission energies ranging from 2 to 8 eV, and projectile scattering angles ranging from 8.5⁰ to 20.0⁰. The experimental tripledifferential cross sections are internormalized across all measured scattering angles and ejected energies. The experimental data are compared to predictions from a hybrid secondorder distortedwave Born plus Rmatrix approach, the distortedwave Born approximation with the inclusion of ...
Directed Search For Gravitational Waves From Scorpius X1 With Initial Ligo Data, J. Aasi, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Directed Search For Gravitational Waves From Scorpius X1 With Initial Ligo Data, J. Aasi, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present results of a search for continuously emitted gravitational radiation, directed at the brightest lowmass xray binary, Scorpius X1. Our semicoherent analysis covers 10 days of LIGO S5 data ranging from 50550 Hz, and performs an incoherent sum of coherent Fstatistic power distributed amongst frequencymodulated orbital sidebands. All candidates not removed at the veto stage were found to be consistent with noise at a 1% false alarm rate. We present Bayesian 95% confidence upper limits on gravitationalwave strain amplitude using two different prior distributions: a standard one, with no a priori assumptions about the orientation of Scorpius X1 ...
Benchmarking Accurate Spectral Phase Retrieval Of Single Attosecond Pulses, Hui Wei, AnhThu Le, Toru Morishita, Chao Yu, C. D. Lin
Benchmarking Accurate Spectral Phase Retrieval Of Single Attosecond Pulses, Hui Wei, AnhThu Le, Toru Morishita, Chao Yu, C. D. Lin
Physics Faculty Research & Creative Works
A single extremeultraviolet (XUV) attosecond pulse or pulse train in the time domain is fully characterized if its spectral amplitude and phase are both determined. The spectral amplitude can be easily obtained from photoionization of simple atoms where accurate photoionization cross sections have been measured from, e.g., synchrotron radiations. To determine the spectral phase, at present the standard method is to carry out XUV photoionization in the presence of a dressing infrared (IR) laser. In this work, we examine the accuracy of current phase retrieval methods (PROOF and iPROOF) where the dressing IR is relatively weak such that photoelectron ...