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 Ionization (5)
 Helium (4)
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 Differential cross sections (2)
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 Effective Mass (2)
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Articles 1  30 of 43
FullText Articles in Physical Sciences and Mathematics
Large Energy Gaps In Cac₆ From Tunneling Spectroscopy: Possible Evidence Of StrongCoupling Superconductivity, Cihan Kurter, Lutfi Ozyuzer, Daniel Mazur, John F. Zasadzinski, Daniel Rosenmann
Large Energy Gaps In Cac₆ From Tunneling Spectroscopy: Possible Evidence Of StrongCoupling Superconductivity, Cihan Kurter, Lutfi Ozyuzer, Daniel Mazur, John F. Zasadzinski, Daniel Rosenmann
Physics Faculty Research & Creative Works
Tunneling in CaC_{6} crystals reproducibly reveals superconducting gaps Δ of 2.3±0.2 meV that are ~40% larger than reported earlier. In an isotropic s wave scenario, that puts CaC_{6} into the class of very strongly coupled superconductors, since 2Δ k Tc ~4.6, implying that soft Ca phonons are primarily involved in the superconductivity. This conclusion explains the relatively large Ca isotope effect found recently for CaC_{6}, but it could also signal a strong anisotropy in the electronphonon interaction.
Zeeman Splitting And G Factor Of The 1s²2s²2p ²P_{3/2} And ²P_{1/2} Levels In Ar¹³⁺, R. Soria Orts, Jose R. Crespo LopezUrrutia, Hjalmar Bruhns, Antonio J. Gonzalez, Zoltan Harman, Ulrich D. Jentschura, Christoph H. Keitel, Alain Lapierre, Hiroyuki Tawara, I. I. Tupitsyn, Joachim Hermann Ullrich, Andrey V. Volotka
Zeeman Splitting And G Factor Of The 1s²2s²2p ²P3/2 And ²P1/2 Levels In Ar¹³⁺, R. Soria Orts, Jose R. Crespo LopezUrrutia, Hjalmar Bruhns, Antonio J. Gonzalez, Zoltan Harman, Ulrich D. Jentschura, Christoph H. Keitel, Alain Lapierre, Hiroyuki Tawara, I. I. Tupitsyn, Joachim Hermann Ullrich, Andrey V. Volotka
Physics Faculty Research & Creative Works
The Zeeman line components of the magneticdipole (M1) 1s^{2} 2s^{2} ^{2} P_{1/2} ^{2}P_{3/2} transition in boronlike Ar^{13+} were experimentally resolved by highprecision emission spectroscopy using the Heidelberg electron beam ion trap. We determined the gyromagnetic (g) factors of the ground and firstexcited levels to be g_{1/2} =0.663(7) and g_{3/2} =1.333(2), respectively. This corresponds to a measurement of the g factor of a relativistic electron in a bound non S state of a multielectron ion with a 1.5 partsperthousand accuracy. The results are compared ...
Coincidence Angular Correlation In Electron Impact Single Or Double Ionisation Of Atoms And Molecules, E. M. StaicuCasagrande, Adnan Naja, Xueguang Ren, Mohammed Nekkab, Fabrice Catoire, F. Mezdari, Azzeddine LahmamBennani, Don H. Madison, Ochbadrakh Chuluunbaatar, Boghos B. Joulakian
Coincidence Angular Correlation In Electron Impact Single Or Double Ionisation Of Atoms And Molecules, E. M. StaicuCasagrande, Adnan Naja, Xueguang Ren, Mohammed Nekkab, Fabrice Catoire, F. Mezdari, Azzeddine LahmamBennani, Don H. Madison, Ochbadrakh Chuluunbaatar, Boghos B. Joulakian
Physics Faculty Research & Creative Works
Experimental results obtained with our multiparameter multicoincidence spectrometer are presented for the (e,3e) double ionisation of Ar and (e,2e) single ionisation of small molecules. The (e,3e) measurements are discussed in terms of competition between the two double ionisation processes present under the chosen kinematics, and qualitative conclusions are given. The results for the ionisation of H_{2} and the outer orbital of N_{2} are compared with the predictions of the most elaborate available theoretical models for description of the molecular ionisation process. Overall reasonable agreement is observed and tentative interpretations for the discrepancies are discussed.
Angular And Polarization Analysis Of XRays Emitted From HighlyCharged, FewElectron Ions, Stephan Fritzsche, Andrey S. Surzhykov, Ulrich D. Jentschura, Th H. Stohlker
Angular And Polarization Analysis Of XRays Emitted From HighlyCharged, FewElectron Ions, Stephan Fritzsche, Andrey S. Surzhykov, Ulrich D. Jentschura, Th H. Stohlker
Physics Faculty Research & Creative Works
The recent theoretical progress in studying the xray emission from highlycharged, fewelectron ions is reviewed. These case studies show that relativistic, highZ ions provide a unique tool for better understanding the interplay between the electronphoton and electronelectron interactions in strong fields. Most naturally, this interplay is probed by the radiative capture of a (quasi) free electron into the bound states of projectile ions, and by varying the charge state and the energy of the projectiles. For the capture into initially hydrogenand lithiumlike ions, here we summarize the recent results for the angular distribution and polarization of the recombination photons as ...
Matched Filtering And Parameter Estimation Of Ringdown Waveforms, Emanuele Berti, Jaime Cardoso, Vitor Cardoso, Marco Cavaglia
Matched Filtering And Parameter Estimation Of Ringdown Waveforms, Emanuele Berti, Jaime Cardoso, Vitor Cardoso, Marco Cavaglia
Physics Faculty Research & Creative Works
Using recent results from numerical relativity simulations of nonspinning binary black hole mergers, we revisit the problem of detecting ringdown waveforms and of estimating the source parameters, considering both LISA and Earthbased interferometers. We find that Advanced LIGO and EGO could detect intermediatemass black holes of mass up to ∼10^{3}M_{⊙} out to a luminosity distance of a few Gpc. For typical multipolar energy distributions, we show that the singlemode ringdown templates presently used for ringdown searches in the LIGO data stream can produce a significant event loss ( > 10% for all detectors in a large interval of black hole ...
TwoCenter Interference In PH2 ElectronTransfer Collisions, Daniel Fischer, M. Gudmundsson, Kristian Stochkel, Zoltan Berenyi, Henrik Cederquist, Nicole Haag, Henrik A B Johansson, Sergey B. Levin, Peter Reinhed, Reinhold S. Schuch, Henning T. Schmidt
TwoCenter Interference In PH2 ElectronTransfer Collisions, Daniel Fischer, M. Gudmundsson, Kristian Stochkel, Zoltan Berenyi, Henrik Cederquist, Nicole Haag, Henrik A B Johansson, Sergey B. Levin, Peter Reinhed, Reinhold S. Schuch, Henning T. Schmidt
Physics Faculty Research & Creative Works
We report on measurements of transfer excitation in collisions of 0.31.3 MeV protons with spatially oriented H_{2} molecules. Evidences of two center interference are found in the angular distribution of the molecule after a transfer excitation process and directly in the projectile angular scattering distributions. These features can be explained in a way which is analogous to that for the interferences in Young's classical double slit experiment: The fast projectiles preferentially capture electrons close to either of the molecular nuclei, and thereby they change their momenta and de Broglie wavelengths. The waves emerging from the two ...
Analysis Of TwoDimensional HighEnergy Photoelectron Momentum Distributions In The Single Ionization Of Atoms By Intense Laser Pulses, Zhangjin Chen, Toru Morishita, AnhThu Le, C. D. Lin
Analysis Of TwoDimensional HighEnergy Photoelectron Momentum Distributions In The Single Ionization Of Atoms By Intense Laser Pulses, Zhangjin Chen, Toru Morishita, AnhThu Le, C. D. Lin
Physics Faculty Research & Creative Works
We analyzed the twodimensional (2D) electron momentum distributions of highenergy photoelectrons of atoms in an intense laser field using the secondorder strong field approximation (SFA2). The SFA2 accounts for the rescattering of the returning electron with the target ion to first order and its validity is established by comparing with results obtained by solving the timedependent Schrödinger equation for short pulses. By analyzing the SFA2 theory, we confirmed that the yield along the back rescattered ridge in the 2D momentum spectra can be interpreted as due to the elastic scattering in the backward directions by the returning electron wave packet ...
Computing Quantum Phase Transitions, Thomas Vojta
Computing Quantum Phase Transitions, Thomas Vojta
Physics Faculty Research & Creative Works
This article first gives a concise introduction to quantum phase transitions, emphasizing similarities with and differences to classical thermal transitions. After pointing out the computational challenges posed by quantum phase transitions, a number of successful computational approaches is discussed. The focus is on classical and quantum Monte Carlo methods, with the former being based on the quantumto classical mapping while the latter directly attack the quantum problem. These methods are illustrated by several examples of quantum phase transitions in clean and disordered systems.
TripleDifferential Cross Sections For Target Ionization With Simultaneous Projectile Detachment In 200Kev H⁻ + He Collisions, T. Ferger, Michael Schulz, Daniel Fischer, B. Najjari, R. Moshammer, J. D. Ullrich
TripleDifferential Cross Sections For Target Ionization With Simultaneous Projectile Detachment In 200Kev H⁻ + He Collisions, T. Ferger, Michael Schulz, Daniel Fischer, B. Najjari, R. Moshammer, J. D. Ullrich
Physics Faculty Research & Creative Works
We have performed a kinematically complete experiment for target ionization with simultaneous projectile detachment (TIPD) in 200keV H^{−} + He collisions. From the data we extracted tripledifferential cross sections (TDCSs) for each electron separately. These TDCSs closely resemble corresponding data for single ionization by chargedparticle impact. Surprisingly, the contributions from higherorder processes to TIPD, proceeding through two independent interactions of each electron with the core of the respective other collision partner, are found to be somewhat larger than the firstorder process proceeding through the electronelectron interaction.
Crystal And Electronic Structures Of The Complex Hydride Li₄Bn₃H₁₀, Jinbo Yang, X. J. Wang, Qingsheng Cai, William B. Yelon, William Joseph James
Crystal And Electronic Structures Of The Complex Hydride Li₄Bn₃H₁₀, Jinbo Yang, X. J. Wang, Qingsheng Cai, William B. Yelon, William Joseph James
Physics Faculty Research & Creative Works
The crystal structure of Li4BN3H10 was investigated using powder neutron diffraction with high sensitivity. The compound crystallizes in the cubic space group 213 with lattice parameters a=10.645 19(52) Å with an ordered arrangement of [NH2]−1 and [BH4]−1 anions in a molar ratio of 3:1. The bond lengths between the nearest nitrogen and hydrogen atoms are 1.04(4) and 1.14(4) Å. The bond angle between H(1)NH(2) is about 126(6)°, while those between H(3)BH(3) and H(3)BH(4) are about 109(6)°110(7)°. There ...
Qcd And Spin Effects In Black Hole Air Showers, Marco Cavaglia, Arunava Roy
Qcd And Spin Effects In Black Hole Air Showers, Marco Cavaglia, Arunava Roy
Physics Faculty Research & Creative Works
In models with large extra dimensions, black holes may be produced in highenergy particle collisions. We revisit the physics of black hole formation in extensive air showers from ultrahighenergy cosmic rays, focusing on collisional QCD and black hole emissivity effects. New results for rotating black holes are presented. Monte Carlo simulations show that QCD effects and black hole spin produce no observable signatures in air showers. These results further confirm that the main characteristics of black holeinduced air showers do not depend on the fine details of microblackhole models.
Analysis Of Experimental Data For IonImpact Single Ionization Of Helium With Monte Carlo Event Generators Based On Quantum Theory, M. Dürr, B. Najjari, Michael Schulz, A. Dorn, R. Moshammer, A. B. Voitkiv, J. Ullrich
Analysis Of Experimental Data For IonImpact Single Ionization Of Helium With Monte Carlo Event Generators Based On Quantum Theory, M. Dürr, B. Najjari, Michael Schulz, A. Dorn, R. Moshammer, A. B. Voitkiv, J. Ullrich
Physics Faculty Research & Creative Works
Recent multiply differential experimental data taken with reaction microscopes severely challenge predictions of quantum mechanical fewbody models. Here, we report on a thorough analysis of all known possible experimental resolution effects and their influence on the extracted cross sections. Using a Monte Carlo event generator to simulate true events on the basis of quantum calculations allows us to consistently incorporate all aspects of the experimental resolution of the reaction microscope. We study the effect of the instrumental function in single ionization of helium by 3.6 MeV/u Au53+ and 100 MeV/u C6+ ions and find it to significantly ...
Theoretical Analysis Of Dynamic Chemical Imaging With Lasers Using HighOrder Harmonic Generation, VanHoang Le, AnhThu Le, RuiHua Xie, C. D. Lin
Theoretical Analysis Of Dynamic Chemical Imaging With Lasers Using HighOrder Harmonic Generation, VanHoang Le, AnhThu Le, RuiHua Xie, C. D. Lin
Physics Faculty Research & Creative Works
We report theoretical investigations of the tomographic procedure suggested by Itatani et al. [Nature (London) 432, 867 (2004)] for reconstructing highest occupied molecular orbitals (HOMOs) using highorder harmonic generation (HHG). Due to the limited range of harmonics from the plateau region, we found that even under the most favorable assumptions, it is still very difficult to obtain accurate HOMO wave functions using the tomographic procedure, but the symmetry of the HOMOs and the internuclear separation between the atoms can be accurately extracted, especially when lasers of longer wavelengths are used to generate the HHG. Since the tomographic procedure relies on ...
Triply Differential Ionization Of Ar By 500 Ev Positron And Electron Impact, O. G. De Lucio, Jared M. Gavin, Robert D. Dubois
Triply Differential Ionization Of Ar By 500 Ev Positron And Electron Impact, O. G. De Lucio, Jared M. Gavin, Robert D. Dubois
Physics Faculty Research & Creative Works
Coincidences between recoil ionsejected electrons and recoil ionsscattered projectiles have been used to study the kinematics of electron and positron impact ionization. Triply Differential (TDCS) data for 500 eV positron and electron impact on Ar are presented here as function of scattering angle for a given range of energy losses. Binary and recoil interactions can be distinguished allowing us to determine the relative intensity between those interactions. Preliminary integration of the data indicate an enhancement of the binary region for positron interaction while for electron impact the intensity of the recoil and binary interactions is comparable.
Bremsstrahlung In Α Decay Reexamined, H. Boie, Heiko Scheit, Ulrich D. Jentschura, F. Kock, M. Lauer, A. I. Milstein, Ivan S. Terekhov, Dirk Schwalm
Bremsstrahlung In Α Decay Reexamined, H. Boie, Heiko Scheit, Ulrich D. Jentschura, F. Kock, M. Lauer, A. I. Milstein, Ivan S. Terekhov, Dirk Schwalm
Physics Faculty Research & Creative Works
A highstatistics measurement of bremsstrahlung emitted in the α decay of ^{210}Po has been performed, which allows us to follow the photon spectra up to energies of ~500keV. The measured differential emission probability is in good agreement with our theoretical results obtained within the quasiclassical approximation as well as with the exact quantum mechanical calculation. It is shown that, due to the small effective electric dipole charge of the radiating system, a significant interference between the electric dipole and quadrupole contributions occurs, which is altering substantially the angular correlation between the α particle and the emitted photon.
Signatures Of Black Holes At The Lhc, Marco Cavaglia, Romulus Godang, Lucien M. Cremaldi, Donald J. Summers
Signatures Of Black Holes At The Lhc, Marco Cavaglia, Romulus Godang, Lucien M. Cremaldi, Donald J. Summers
Physics Faculty Research & Creative Works
Signatures of black hole events at CERN's Large Hadron Collider are discussed. Event simulations are carried out with the Fortran Monte Carlo generator CATFISH. Inelasticity effects, exact field emissivities, color and charge conservation, corrections to semiclassical black hole evaporation, gravitational energy loss at formation and possibility of a black hole remnant are included in the analysis.
LaserAssisted Bremsstrahlung For Circular And Linear Polarization, Stephan Schnez, Erik Lotstedt, Ulrich D. Jentschura, Christoph H. Keitel
LaserAssisted Bremsstrahlung For Circular And Linear Polarization, Stephan Schnez, Erik Lotstedt, Ulrich D. Jentschura, Christoph H. Keitel
Physics Faculty Research & Creative Works
We numerically evaluate the cross sections for spontaneous bremsstrahlung emission in a laser field for both circular and linear laser polarization, in a regime where the classical ponderomotive energies for the considered laser intensities are considerably larger than the rest mass of the electron. A fully relativistic quantumelectrodynamic approach using the Volkov solutions of an electron in an external field and DiracVolkov propagators for the intermediate electrons is applied. We compare circular to linear polarization and point out several interesting features of the laserdressed cross sections. Regularizations in both electron and photon propagators are required. Specifically, imaginary mass and energy ...
Radiative Orbital Electron Capture By The Atomic Nucleus, Krzysztof Pachucki, Ulrich D. Jentschura, Marek M. Pfutzner
Radiative Orbital Electron Capture By The Atomic Nucleus, Krzysztof Pachucki, Ulrich D. Jentschura, Marek M. Pfutzner
Physics Faculty Research & Creative Works
The rate for the photon emission accompanying orbital 1S electron capture by the atomic nucleus is recalculated. While a photon can be emitted by the electron or by the nucleus, the use of the length gauge significantly suppresses the nuclear contribution. Our calculations resolve the long standing discrepancy of theoretical predictions with experimental data for ΔJ=2 forbidden transitions. We illustrate the results by comparison with the data established experimentally for the first forbidden unique decays of ^{41}Ca and ^{204}Tl.
FewPhoton Multiple Ionization Of Ne And Ar By Strong FreeElectronLaser Pulses, Robert Moshammer, Yuhai Jiang, L. Foucar, Artem Rudenko, Th. Ergler, Claus Dieter Schroter, S. Ludemann, Karl Zrost, Daniel Fischer, J. Titze, Till Jahnke, Markus S. Schoffler, Th Weber, Reinhard Dorner, Theo J.M. Zouros, Alexander Dorn, T. Ferger, Kai Uwe Kuhnel, S. Dusterer, R. Treusch, Paul Radcliffe, Elke Plonjes, Joachim Hermann Ullrich
FewPhoton Multiple Ionization Of Ne And Ar By Strong FreeElectronLaser Pulses, Robert Moshammer, Yuhai Jiang, L. Foucar, Artem Rudenko, Th. Ergler, Claus Dieter Schroter, S. Ludemann, Karl Zrost, Daniel Fischer, J. Titze, Till Jahnke, Markus S. Schoffler, Th Weber, Reinhard Dorner, Theo J.M. Zouros, Alexander Dorn, T. Ferger, Kai Uwe Kuhnel, S. Dusterer, R. Treusch, Paul Radcliffe, Elke Plonjes, Joachim Hermann Ullrich
Physics Faculty Research & Creative Works
Fewphoton multiple ionization of Ne and Ar atoms by strong vacuum ultraviolet laser pulses from the freeelectron laser at Hamburg was investigated differentially with the Heidelberg reaction microscope. The lightintensity dependence of Ne^{2+} production reveals the dominance of nonsequential twophoton double ionization at intensities of I< 6 x 10^{12}W/cm^{2} and significant contributions of threephoton ionization as I increases. Ne^{2+} recoilionmomentum distributions suggest that two electrons absorbing "instantaneously" two photons are ejected most likely into opposite hemispheres with similar energies.
Doubly Differential Single And Multiple Ionization Of Krypton By Electron Impact, O. G. De Lucio, Jared M. Gavin, Robert D. Dubois
Doubly Differential Single And Multiple Ionization Of Krypton By Electron Impact, O. G. De Lucio, Jared M. Gavin, Robert D. Dubois
Physics Faculty Research & Creative Works
Differential measurements for single and multiple ionization of Kr by 240 and 500 eV electron impact are presented. Using a pulsed extraction field, Kr+, Kr2+, and Kr3+ ions were measured in coincidence with scattered electrons for energy losses up to 120 eV and scattering angles between 16° and 90°. Scaling properties of the doubly differential cross sections (DDCS) are investigated as a function of energy loss, scattering angle, and momentum transfer. It is shown that scaling the DDCS as outlined by Kim and Inokuti and plotting them versus a parameter consisting of the momentum transfer divided by the square root ...
Ionization And IonizationExcitation Of Helium To The N=14 States Of He⁺ By Electron Impact, Susan M. Bellm, Julian C A Lower, Klaus Bartschat, Xiaoxu Guan, Daniel Weflen, Matthew S. Foster, Allison L. Harris, Don H. Madison
Ionization And IonizationExcitation Of Helium To The N=14 States Of He⁺ By Electron Impact, Susan M. Bellm, Julian C A Lower, Klaus Bartschat, Xiaoxu Guan, Daniel Weflen, Matthew S. Foster, Allison L. Harris, Don H. Madison
Physics Faculty Research & Creative Works
We present experimental and theoretical results for the electronimpactinduced ionization of groundstate helium atoms. Using a highsensitivity toroidal electron spectrometer, we measured crosssection ratios for transitions leading to the first three excited states of the residual helium ion relative to the transition leaving the ion in the ground state. Measurements were performed for both symmetric and asymmetricenergysharing kinematics. By presenting results as a ratio, a direct comparison can be made between theoretical and experimental predictions without recourse to normalization. The experimental data are compared to theoretical predictions employing various firstorder models and a secondorder hybrid distortedwave + convergent R matrix with ...
Gravitational Larmor Formula In Higher Dimensions, Vitor Cardoso, Marco Cavaglia, JunQuo Guo
Gravitational Larmor Formula In Higher Dimensions, Vitor Cardoso, Marco Cavaglia, JunQuo Guo
Physics Faculty Research & Creative Works
The Larmor formula for scalar and gravitational radiation from a pointlike particle is derived in any even higherdimensional flat spacetime. General expressions for the field in the wave zone and the energy flux are obtained in closed form. The explicit results in four and six dimensions are used to illustrate the effect of extra dimensions on linear and uniform circular motion. Prospects for detection of bulk gravitational radiation are briefly discussed.
Fragmentation Of Molecules By Fast Ion Impact, Christina Dimopoulou, Nicole Haag, Robert Moshammer, Pablo Daniel Fainstein, Alexander Dorn, M. Durr, Daniel Fischer, Joachim Hermann Ullrich
Fragmentation Of Molecules By Fast Ion Impact, Christina Dimopoulou, Nicole Haag, Robert Moshammer, Pablo Daniel Fainstein, Alexander Dorn, M. Durr, Daniel Fischer, Joachim Hermann Ullrich
Physics Faculty Research & Creative Works
Single ionization of simple molecules, e.g. H_{2}, CO_{2}, by fast charged particle impact has been studied using a reaction microscope. By measuring the momenta of the emitted electron and the recoil ionic fragment in coincidence, channelselective lowenergy electron spectra have been recorded. The experimental cross sections will be presented, compared with the predictions of stateoftheart CDWEIS calculations and discussed in terms of molecular effects such as (i) autoionization and predissociation channels, (ii) interference patterns resulting from the twocenter geometry of the diatomic molecule, in analogy to Young's doubleslit experiment and (iii) dependence of the electron emission ...
Correlation And Quantum Electrodynamic Effects On The Radiative Lifetime And Relativistic Nuclear Recoil In Ar¹³⁺ And Ar¹⁴⁺ Ions, Zoltan Harman, Ulrich D. Jentschura, Christoph H. Keitel, Alain Lapierre, R. Soria Orts, Jose R. Crespo LopezUrrutia, Hiroyuki Tawara, Joachim Hermann Ullrich, Anton N. Artemyev, I. I. Tupitsyn, Andrey V. Volotka, Vladimir M. Shabaev
Correlation And Quantum Electrodynamic Effects On The Radiative Lifetime And Relativistic Nuclear Recoil In Ar¹³⁺ And Ar¹⁴⁺ Ions, Zoltan Harman, Ulrich D. Jentschura, Christoph H. Keitel, Alain Lapierre, R. Soria Orts, Jose R. Crespo LopezUrrutia, Hiroyuki Tawara, Joachim Hermann Ullrich, Anton N. Artemyev, I. I. Tupitsyn, Andrey V. Volotka, Vladimir M. Shabaev
Physics Faculty Research & Creative Works
The radiative lifetime and mass isotope shift of the 1s^{2}2s^{2}2p ^{2}P_{3/2}  ^{2}P_{1/2} M1 transition in Ar^{13+} ions have been determined with high accuracies using the Heidelberg electron beam ion trap. This fundamentally relativistic transition provides unique possibilities for performing precise studies of correlation and quantum electrodynamic effects in manyelectron systems. The lifetime corresponding to the transition has been measured with an accuracy of the order of one per thousand. Theoretical calculations predict a lifetime that is in significant disagreement with this highprecision experimental value. Our mass shift calculations, based ...
Effects Of Configuration Interaction On The Alignment Of BerylliumLike Ions, Andrey S. Surzhykov, Ulrich D. Jentschura, Th H. Stohlker, Stephan Fritzsche
Effects Of Configuration Interaction On The Alignment Of BerylliumLike Ions, Andrey S. Surzhykov, Ulrich D. Jentschura, Th H. Stohlker, Stephan Fritzsche
Physics Faculty Research & Creative Works
The radiative electron capture into (initially) lithiumlike ions is studied within the framework of the density matrix approach. Special attention is paid to the magnetic sublevel population of the residual ionic states which is described by a set of alignment parameters. Detailed calculations of these parameters have been performed for the capture into the 1s^{2} 2s 3d_{3/2} J_{f}2 level of highZ ions along the beryllium isoelectronic sequence. We devote special attention to the modifications in the manyelectron case as opposed to singleelectron systems. The electron correlation leads to an enhancement of the alignment, which becomes ...
Entrainment And Stimulated Emission Of AutoOscillators In An Acoustic Cavity, Richard L. Weaver, Oleg I. Lobkis, Alexey Yamilov
Entrainment And Stimulated Emission Of AutoOscillators In An Acoustic Cavity, Richard L. Weaver, Oleg I. Lobkis, Alexey Yamilov
Physics Faculty Research & Creative Works
We report theory, measurements and numerical simulations on nonlinear piezoelectric ultrasonic devices with stable limit cycles. The devices are shown to exhibit behavior familiar from the theory of coupled autooscillators. Frequency of autooscillation is affected by the presence of an acoustic cavity as these spontaneously emitting devices adjust their frequency to the spectrum of the acoustic cavity. Also, the autooscillation is shown to be entrained by an applied field; the oscillator synchronizes to an incident wave at a frequency close to the natural frequency of the limit cycle. It is further shown that synchronization occurs here with a phase that ...
Reconciliation Of Measured Fully Differential Single Ionization Data With The First Born Approximation Convoluted With Elastic Scattering, Michael Schulz, M. Dürr, B. Najjari, R. Moshammer, J. D. Ullrich
Reconciliation Of Measured Fully Differential Single Ionization Data With The First Born Approximation Convoluted With Elastic Scattering, Michael Schulz, M. Dürr, B. Najjari, R. Moshammer, J. D. Ullrich
Physics Faculty Research & Creative Works
An analysis of experimental fully differential data for single ionization in 100 MeV/amu C6++He collisions is reported. We present a convolution of the first Born approximation with elastic scattering by using an event generator technique. Furthermore, the calculation is convoluted with all known experimental resolutions. Our analysis shows that elastic scattering is a viable explanation for surprising structures observed in the fully differential cross sections outside the scattering plane. Furthermore, it may even explain discrepancies in the “recoil peak” frequently observed for both ion and electron impact.
Erratum: Evaluation Of LaserAssisted Bremsstrahlung With DiracVolkov Propagators (Physical Review Letters (2007) 98 (043002)), Erik Lotstedt, Ulrich D. Jentschura, Christoph H. Keitel
Erratum: Evaluation Of LaserAssisted Bremsstrahlung With DiracVolkov Propagators (Physical Review Letters (2007) 98 (043002)), Erik Lotstedt, Ulrich D. Jentschura, Christoph H. Keitel
Physics Faculty Research & Creative Works
No abstract provided.
Photon Angular Distribution And NuclearState Alignment In Nuclear Excitation By Electron Capture, Adriana Palffy, Zoltan Harman, Andrey S. Surzhykov, Ulrich D. Jentschura
Photon Angular Distribution And NuclearState Alignment In Nuclear Excitation By Electron Capture, Adriana Palffy, Zoltan Harman, Andrey S. Surzhykov, Ulrich D. Jentschura
Physics Faculty Research & Creative Works
The alignment of nuclear states resonantly formed in nuclear excitation by electron capture (NEEC) is studied by means of a density matrix technique. The vibrational excitations of the nucleus are described by a collective model and the electrons are treated in a relativistic framework. Formulas for the angular distribution of photons emitted in the nuclear relaxation are derived. We present numerical results for alignment parameters and photon angular distributions for a number of heavy elements in the case of E2 nuclear transitions. Our results are intended to help future experimental attempts to discern NEEC from radiative recombination, which is the ...
Averaging Of The Electron Effective Mass In Multicomponent Transparent Conducting Oxides, Julia E. Medvedeva
Averaging Of The Electron Effective Mass In Multicomponent Transparent Conducting Oxides, Julia E. Medvedeva
Physics Faculty Research & Creative Works
We find that layered materials composed of various oxides of cations with s^{2} electronic configuration, XY_{2}O_{4}, X = in or Sc, Y = Ga, Zn, Al, Cd and/or Mg, exhibit isotropic electron effective mass which can be obtained via averaging over those of the corresponding singlecation oxide constituents. This effect is due to a hybrid nature of the conduction band formed from the sstates of all cations and the oxygen pstates. Moreover, the observed insensitivity of the electron effective mass to the oxygen coordination and to the distortions in the cationoxygen chains suggests that a similar behavior ...