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 Impact ionization (5)
 Rescattering (4)
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 High Order Harmonic Generation (3)
 Harmonic Analysis (3)

 Atomic physics (3)
 Polarization (3)
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 Protons (3)
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 Deuterium (2)
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Articles 1  30 of 44
FullText Articles in Physical Sciences and Mathematics
Directional Limits On Persistent Gravitational Waves Using Ligo S5 Science Data, J. Abadie, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Directional Limits On Persistent Gravitational Waves Using Ligo S5 Science Data, J. Abadie, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
The gravitationalwave (GW) sky may include nearby pointlike sources as well as stochastic backgrounds. We perform two directional searches for persistent GWs using data from the LIGO S5 science run: one optimized for pointlike sources and one for arbitrary extended sources. Finding no evidence to support the detection of GWs, we present 90% confidence level (C.L.) upperlimit maps of GW strain power with typical values between 2  20 x 10^{50} strain^{2} Hz^{1} and 5  35 x 10^{49} strain^{2}Hz^{1}sr^{1} for pointlike and extended sources, respectively. The latter result is the first ...
Thermal Correction To The Molar Polarizability Of A Boltzmann Gas, Ulrich D. Jentschura, Mariusz Puchalski, Peter J. Mohr
Thermal Correction To The Molar Polarizability Of A Boltzmann Gas, Ulrich D. Jentschura, Mariusz Puchalski, Peter J. Mohr
Physics Faculty Research & Creative Works
Metrology in atomic physics has been crucial for a number of advanced determinations of fundamental constants. In addition to very precise frequency measurements, the molar polarizability of an atomic gas has recently also been measured very accurately. Part of the motivation for the measurements is due to ongoing efforts to redefine the International System of Units (SI), for which an accurate value of the Boltzmann constant is needed. Here we calculate the dominant shift of the molar polarizability in an atomic gas due to thermal effects. It is given by the relativistic correction to the dipole interaction, which emerges when ...
Prospects For Determination Of Thermal History After Inflation With Future Gravitational Wave Detectors, Sachiko Kuroyanagi, Kazunori Nakayama, Shun Saito
Prospects For Determination Of Thermal History After Inflation With Future Gravitational Wave Detectors, Sachiko Kuroyanagi, Kazunori Nakayama, Shun Saito
Physics Faculty Research & Creative Works
Thermal history of the Universe between inflation and bigbang nucleosynthesis has not yet been revealed observationally. It will be probed by the detection of primordial gravitational waves generated during inflation, which contain information on the reheating temperature as well as the equation of state of the Universe after inflation. Based on the Fisher information formalism, we examine how accurately the tensortoscalar ratio and reheating temperature after inflation can be simultaneously determined with spacebased gravitational wave detectors such as the DECIhertz Interferometer Gravitationalwave Observatory and the BigBang Observer. We show that the reheating temperature is best determined if it is around ...
InfiniteRandomness Criticality In A Randomly Layered Heisenberg Magnet, Fawaz Hrahsheh, Hatem Barghathi, Thomas Vojta
InfiniteRandomness Criticality In A Randomly Layered Heisenberg Magnet, Fawaz Hrahsheh, Hatem Barghathi, Thomas Vojta
Physics Faculty Research & Creative Works
We study the ferromagnetic phase transition in a randomly layered Heisenberg magnet using largescale Monte Carlo simulations. Our results provide numerical evidence for the infiniterandomness scenario recently predicted within a strongdisorder renormalizationgroup approach. Specifically, we investigate the finitesize scaling behavior of the magnetic susceptibility, which is characterized by a nonuniversal powerlaw divergence in the Griffiths phase. We also study the perpendicular and parallel spinwave stiffnesses in the Griffiths phase. In agreement with the theoretical predictions, the parallel stiffness is nonzero for all temperatures T < T_{c}. In contrast, the perpendicular stiffness remains zero in part of the ordered phase, giving rise ...
Quantum Phase Transition Of The SubOhmic Rotor Model, Manal AlAli, Thomas Vojta
Quantum Phase Transition Of The SubOhmic Rotor Model, Manal AlAli, Thomas Vojta
Physics Faculty Research & Creative Works
We investigate the behavior of an Ncomponent quantum rotor coupled to a bosonic dissipative bath having a subOhmic spectral density J (ω) ∝ ω^{s }with s < 1.With increasing dissipation strength, this system undergoes a quantum phase transition from a delocalized phase to a localized phase.We determine the exact critical behavior of this transition in the largeN limit. For 1 > s > 1/2, we find nontrivial critical behavior corresponding to an interacting renormalization group fixed point, while we find meanfield behavior for s < 1/2. The results agree with those of the corresponding longrange interacting classical model ...
Influence Of Gas Pressure On HighOrderHarmonic Generation Of Ar And Ne, Guoli Wang, Cheng Jin, AnhThu Le, C. D. Lin
Influence Of Gas Pressure On HighOrderHarmonic Generation Of Ar And Ne, Guoli Wang, Cheng Jin, AnhThu Le, C. D. Lin
Physics Faculty Research & Creative Works
We study the effect of gas pressure on the generation of highorder harmonics where harmonics due to individual atoms are calculated using the recently developed quantitative rescattering theory, and the propagation of the laser and harmonics in the medium is calculated by solving the Maxwell's wave equation. We illustrate that the simulated spectra are very sensitive to the laser focusing conditions at high laser intensity and high pressure since the fundamental laser field is severely reshaped during the propagation. By comparing the simulated results with several experiments we show that the pressure dependence can be qualitatively explained. The lack ...
Generation Of Isolated Attosecond Pulses In The Far Field By Spatial Filtering With An Intense FewCycle MidInfrared Laser, Cheng Jin, AnhThu Le, Carlos A. TralleroHerrero, C. D. Lin
Generation Of Isolated Attosecond Pulses In The Far Field By Spatial Filtering With An Intense FewCycle MidInfrared Laser, Cheng Jin, AnhThu Le, Carlos A. TralleroHerrero, C. D. Lin
Physics Faculty Research & Creative Works
We report theoretical calculations of highorder harmonic generation (HHG) of Xe with the inclusion of multielectron effects and macroscopic propagation of the fundamental and harmonic fields in an ionizing medium. By using the timefrequency analysis we show that the reshaping of the fundamental laser field is responsible for the continuum structure in the HHG spectra. We further suggest a method for obtaining an isolated attosecond pulse (IAP) by using a filter centered on axis to select the harmonics in the far field with different divergence. We also discuss the carrierenvelopephase dependence of an IAP and the possibility to optimize the ...
Orientation Dependence Of The Ionization Of Co And No In An Intense Femtosecond TwoColor Laser Field, H. Li, D. Ray, S. De, I. Znakovskaya, W. Cao, G. Laurent, Z. Wang, M. F. Kling, AnhThu Le, C. L. Cocke
Orientation Dependence Of The Ionization Of Co And No In An Intense Femtosecond TwoColor Laser Field, H. Li, D. Ray, S. De, I. Znakovskaya, W. Cao, G. Laurent, Z. Wang, M. F. Kling, AnhThu Le, C. L. Cocke
Physics Faculty Research & Creative Works
Twocolor (800 and 400nm) short (45fs) linearly polarized pulses are used to ionize and dissociate CO and NO. The emission of C^{q+}, N^{q+}, and O⁺ fragments indicates that the higher ionization rate occurs when the peak electric field points from C to O in CO and from N to O in NO. This preferred direction is in agreement with that predicted by Starkcorrected strongfieldapproximation calculations.
Reply To "Comment On 'Counterintuitive Consequence Of Heating In StronglyDriven Intrinsic Junctions Of Bi₂Sr₂Cacu₂O _{8+Δ} Mesas'", Cihan Kurter, Lutfi Ozyuzer, Thomas Proslier, John F. Zasadzinski, David G. Hinks, Kenneth E. Gray
Reply To "Comment On 'Counterintuitive Consequence Of Heating In StronglyDriven Intrinsic Junctions Of Bi₂Sr₂Cacu₂O 8+Δ Mesas'", Cihan Kurter, Lutfi Ozyuzer, Thomas Proslier, John F. Zasadzinski, David G. Hinks, Kenneth E. Gray
Physics Faculty Research & Creative Works
The main criticism raised in the preceding Comment concerns our suggestion that sharp conduction peaks in Bi2Sr_{2}CaCu_{2}O _{8+δ} mesas, along with absent diphump features, may, in general, be a result of selfheating. The author points to the variety of experimental configurations, matrixelement effects, and doping dependencies that might allow a diversity of conductance spectra. We argue that numerous mesa studies (with fixed matrix elements) firmly establish the systematic development of sharp conductance peaks with increased selfheating, and thus, the issue of nonuniversality of tunneling characteristics is not relevant. The author mentions a number of studies ...
Transport Properties In Antiferromagnetic Quantum Griffiths Phases, David Nozadze, Thomas Vojta
Transport Properties In Antiferromagnetic Quantum Griffiths Phases, David Nozadze, Thomas Vojta
Physics Faculty Research & Creative Works
We study the electrical resistivity in the quantum Griffiths phase associated with the antiferromagnetic quantum phase transition in a metal. The resistivity is calculated by means of the semiclassical Boltzmann equation. We show that the scattering of electrons by locally ordered rare regions leads to a singular temperature dependence. The rareregion contribution to the resistivity varies as T^{λ} with temperature T, where λ is the usual Griffiths exponent which takes the value zero at the critical point and increases with distance from criticality. We find similar singular contributions to other transport properties such as thermal resistivity, thermopower and the ...
Double Ionization Of Helium By HighlyChargedIon Impact Analyzed Within The FrozenCorrelation Approximation, Marcelo F. Ciappina, Tom Kirchner, Michael Schulz
Double Ionization Of Helium By HighlyChargedIon Impact Analyzed Within The FrozenCorrelation Approximation, Marcelo F. Ciappina, Tom Kirchner, Michael Schulz
Physics Faculty Research & Creative Works
We apply the frozencorrelation approximation (FCA) to analyze double ionization of helium by energetic highly charged ions. In this model the double ionization amplitude is represented in terms of single ionization amplitudes, which we evaluate within the continuum distorted waveeikonal initial state (CDWEIS) approach. Correlation effects are incorporated in the initial and final states, but are neglected during the time the collision process takes place. We implement the FCA using the Monte Carlo event generator technique, which allows us to generate theoretical event files and to compare theory and experiment using the same analysis tools. The comparison with previous theoretical ...
Microscopic Examination Of Hot Spots Giving Rise To Nonlinearity In Superconducting Resonators, Cihan Kurter, Alexander P. Zhuravel, Alexey V. Ustinov, Steven M. Anlage
Microscopic Examination Of Hot Spots Giving Rise To Nonlinearity In Superconducting Resonators, Cihan Kurter, Alexander P. Zhuravel, Alexey V. Ustinov, Steven M. Anlage
Physics Faculty Research & Creative Works
We investigate the microscopic origins of nonlinear rf response in superconducting electromagnetic resonators. Strong nonlinearity appearing in the transmission spectra at high input powers manifests itself through the emergence of jumplike features near the resonant frequency that evolve toward lower quality factor with higher insertion loss as the rf input power is increased. We directly relate these characteristics to the dynamics of localized normal regions (hot spots) caused by microscopic features in the superconducting material making up the resonator. A clear observation of hotspot formation inside a Nb thin film selfresonant structure is presented by employing the microwave laser scanning ...
StrongField Nonsequential Double Ionization Of Ar And Ne, Zhangjin Chen, Yaqiu Liang, Don H. Madison, Chiidong Lin
StrongField Nonsequential Double Ionization Of Ar And Ne, Zhangjin Chen, Yaqiu Liang, Don H. Madison, Chiidong Lin
Physics Faculty Research & Creative Works
We investigate the nonsequential double ionization (NSDI) of Ar and Ne based on quantitative rescattering theory (QRS). According to QRS theory, each elementary NSDI process can be calculated by multiplying the returning electron wave packet with appropriate differential electronion scattering cross sections. We include (e, 2e) and electronimpact excitation cross sections of Ar^{+} to obtain the correlated electron momentum spectra for the NSDI of Ar by fewcycle pulses to check the dependence of NSDI on the carrierenvelope phase. The results are compared to the ion momentum spectra from the recent experiment of Johnson [Phys. Rev. APLRAAN1050294710.1103/ PhysRevA.83.013412 ...
Mutual Projectile And Target Ionization In 1Mev/Amu N⁴⁺ And N₅⁺+ He Collisions, Xincheng Wang, Katharina R. Schneider, Aditya H. Kelkar, Gunterschul Brenner, Michael Schulz, B. Najjari, Alexander B. Voitkiv, M. Gundmundsson, Manfred Grieser, Claude Krantz, Michael Lestinsky, Andreas R. Wolf, Siegbert Hagmann, Robert Moshammer, Joachim Hermann Ullrich, Daniel Fischer
Mutual Projectile And Target Ionization In 1Mev/Amu N⁴⁺ And N₅⁺+ He Collisions, Xincheng Wang, Katharina R. Schneider, Aditya H. Kelkar, Gunterschul Brenner, Michael Schulz, B. Najjari, Alexander B. Voitkiv, M. Gundmundsson, Manfred Grieser, Claude Krantz, Michael Lestinsky, Andreas R. Wolf, Siegbert Hagmann, Robert Moshammer, Joachim Hermann Ullrich, Daniel Fischer
Physics Faculty Research & Creative Works
We have studied mutual projectile and target ionization in 1MeV/amu N^{4+} and N^{5+}+He collisions in kinematically complete experiments by measuring the momenta of the recoil ion and both ejected electrons in coincidence with the chargechanged projectiles. By means of fourparticle Dalitz plots, in which multiple differential cross sections are presented as a function of the momenta of all four particles, experimental spectra are compared with theoretical results from various models. The experimental data are qualitatively reproduced by higherorder calculations, where good agreement is achieved for N^{5+}+He collisions, while some discrepancies persist for N^{4 ...}
Classical Analogue Of Electromagnetically Induced Transparency With A MetalSuperconductor Hybrid Metamaterial, Cihan Kurter, Philippe Tassin, Lei Zhang, Thomas Koschny, Alexander P. Zhuravel, Alexey V. Ustinov, Steven Mark Anlage, Costas M. Soukoulis
Classical Analogue Of Electromagnetically Induced Transparency With A MetalSuperconductor Hybrid Metamaterial, Cihan Kurter, Philippe Tassin, Lei Zhang, Thomas Koschny, Alexander P. Zhuravel, Alexey V. Ustinov, Steven Mark Anlage, Costas M. Soukoulis
Physics Faculty Research & Creative Works
Metamaterials are engineered materials composed of small electrical circuits producing novel interactions with electromagnetic waves. Recently, a new class of metamaterials has been created to mimic the behavior of media displaying electromagnetically induced transparency (EIT). Here we introduce a planar EIT metamaterial that creates a very large loss contrast between the dark and radiative resonators by employing a superconducting Nb film in the dark element and a normalmetal Au film in the radiative element. Below the critical temperature of Nb, the resistance contrast opens up a transparency window along with a large enhancement in group delay, enabling a significant slowdown ...
Relativistic ReducedMass And Recoil Corrections To Vacuum Polarization In Muonic Hydrogen, Muonic Deuterium, And Muonic Helium Ions, Ulrich D. Jentschura
Relativistic ReducedMass And Recoil Corrections To Vacuum Polarization In Muonic Hydrogen, Muonic Deuterium, And Muonic Helium Ions, Ulrich D. Jentschura
Physics Faculty Research & Creative Works
The reducedmass dependence of relativistic and radiative effects in simple muonic bound systems is investigated. The spindependent nuclear recoil correction of order (Zα)^{4}μ^{3}/m^{2}_{N} is evaluated for muonic hydrogen and deuterium and muonic helium ions (μ is the reduced mass and m_{N} is the nuclear mass). Relativistic corrections to vacuum polarization of order α(Zα)^{4}μ are calculated, with a full account of the reducedmass dependence. The results shift theoretical predictions. The radiativerecoil correction to vacuum polarization of order α(Zα)^{5}ln^{2}(Zα) μ^{2}/m_{N} is obtained in leading ...
Evidence For PowerLaw Griffiths Singularities In A Layered Heisenberg Magnet, Fawaz Hrahsheh, Hatem Barghathi, Priyanka Mohan, Rajesh Narayanan, Thomas Vojta
Evidence For PowerLaw Griffiths Singularities In A Layered Heisenberg Magnet, Fawaz Hrahsheh, Hatem Barghathi, Priyanka Mohan, Rajesh Narayanan, Thomas Vojta
Physics Faculty Research & Creative Works
We study the ferromagnetic phase transition in a randomly layered Heisenberg model. A recent strongdisorder renormalization group approach [Phys. Rev. B 81, 144407 (2010)] predicted that the critical point in this system is of exotic infiniterandomness type and is accompanied by strong powerlaw Griffiths singularities. Here, we report results of MonteCarlo simulations that provide numerical evidence in support of these predictions. Specifically, we investigate the finitesize scaling behavior of the magnetic susceptibility which is characterized by a nonuniversal powerlaw divergence in the Griffiths phase. In addition, we calculate the time autocorrelation function of the spins. It features a very slow ...
CompositionTuned Smeared Phase Transitions, Fawaz Hrahsheh, David Nozadze, Thomas Vojta
CompositionTuned Smeared Phase Transitions, Fawaz Hrahsheh, David Nozadze, Thomas Vojta
Physics Faculty Research & Creative Works
Phase transitions in random systems are smeared if individual spatial regions can order independently of the bulk system. In this paper, we study such smeared phase transitions (both classical and quantum) in substitutional alloys A _{1x}B _{x} that can be tuned from an ordered phase at composition x=0 to a disordered phase at x=1. We show that the ordered phase develops a pronounced tail that extends over all compositions x<1. Using optimal fluctuation theory, we derive the composition dependence of the order parameter and other quantities in the tail of the smeared phase transition. We also compare our results to computer simulations of a toy model, and we discuss experiments.
YoungType Interference In ProjectileElectron Loss In Energetic IonMolecule Collisions, Alexander B. Voitkiv, B. Najjari, Daniel Fischer, Anton N. Artemyev, Andrey S. Surzhykov
YoungType Interference In ProjectileElectron Loss In Energetic IonMolecule Collisions, Alexander B. Voitkiv, B. Najjari, Daniel Fischer, Anton N. Artemyev, Andrey S. Surzhykov
Physics Faculty Research & Creative Works
Under certain conditions an electron bound in a fast projectile ion, colliding with a molecule, interacts mainly with the nuclei and inner shell electrons of atoms forming the molecule. Because of their compact localization in space and distinct separation from each other, these molecular centers play in such collisions a role similar to that of optical slits in light scattering leading to pronounced interference in the spectra of the electron emitted from the projectile.
Search For Gravitational Wave Bursts From Six Magnetars, J. Abadie, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Search For Gravitational Wave Bursts From Six Magnetars, J. Abadie, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
Soft gamma repeaters (SGRs) and anomalous Xray pulsars (AXPs) are thought to be magnetars: neutron stars powered by extreme magnetic fields. These rare objects are characterized by repeated and sometimes spectacular gammaray bursts. The burst mechanism might involve crustal fractures and excitation of nonradial modes which would emit gravitational waves (GWs). We present the results of a search for GW bursts from six galactic magnetars that is sensitive to neutron star fmodes, thought to be the most efficient GW emitting oscillatory modes in compact stars. One of them, SGR 0501+4516, is likely ∼1kpc from Earth, an order of ...
Search For Gravitational Waves From Binary Black Hole Inspiral, Merger, And Ringdown, J. Abadie, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Search For Gravitational Waves From Binary Black Hole Inspiral, Merger, And Ringdown, J. Abadie, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present the first modeled search for gravitational waves using the complete binary blackhole gravitational waveform from inspiral through the merger and ringdown for binaries with negligible component spin. We searched approximately 2 years of LIGO data, taken between November 2005 and September 2007, for systems with component masses of 199M_{⊙} and total masses of 25100M_{⊙}. We did not detect any plausible gravitationalwave signals but we do place upper limits on the merger rate of binary black holes as a function of the component masses in this range. We constrain the rate of mergers for 19M_{⊙} ≤m _{1}, m_{2 ...}
Analysis Of Effects Of Macroscopic Propagation And Multiple Molecular Orbitals On The Minimum In HighOrder Harmonic Generation Of Aligned Co₂, Cheng Jin, AnhThu Le, C. D. Lin
Analysis Of Effects Of Macroscopic Propagation And Multiple Molecular Orbitals On The Minimum In HighOrder Harmonic Generation Of Aligned Co₂, Cheng Jin, AnhThu Le, C. D. Lin
Physics Faculty Research & Creative Works
We report theoretical calculations of the effect of the multipleorbital contribution in highorder harmonic generation (HHG) of aligned CO₂ with the inclusion of macroscopic propagation of harmonic fields in the medium. Our results show very good agreement with recent experiments for the dynamics of the minimum in HHG spectra as laser intensity or alignment angle changes. Calculations are carried out to check how the position of the minimum in HHG spectra depends on the degrees of molecular alignment, laserfocusing conditions, and the effects of alignmentdependent ionization rates of the different molecular orbitals. These analyses help to explain why the minima ...
Forecasting The Cosmological Constraints With Anisotropic Baryon Acoustic Oscillations From Multipole Expansion, Atsushi Taruya, Shun Saito, Takahiro Nishimichi
Forecasting The Cosmological Constraints With Anisotropic Baryon Acoustic Oscillations From Multipole Expansion, Atsushi Taruya, Shun Saito, Takahiro Nishimichi
Physics Faculty Research & Creative Works
Baryon acoustic oscillations imprinted in the galaxy power spectrum can be used as a standard ruler to determine the angular diameter distance and Hubble parameter from highredshift galaxies. Combining redshift distortion effect which apparently distorts the galaxy clustering pattern, we can also constrain the growth rate of largescale structure formation. Usually, future forecasts for constraining these parameters from galaxy redshift surveys are made with the full 2D power spectrum characterized as a function of wave number k and directional cosine µ between lineofsight direction and wave vector, i.e., P(k,µ). Here, we apply the multipole expansion to the ...
SelfEnergy Correction To The Hyperfine Splitting For Excited States, Benedikt J. Wundt, Ulrich D. Jentschura
SelfEnergy Correction To The Hyperfine Splitting For Excited States, Benedikt J. Wundt, Ulrich D. Jentschura
Physics Faculty Research & Creative Works
The selfenergy corrections to the hyperfine splitting is evaluated for higher excited states in hydrogenlike ions using an expansion in the binding parameter Zα, where Z is the nuclearcharge number and α is the finestructure constant. We present analytic results for D, F, and G states, and for a number of highly excited Rydberg states, with principal quantum numbers in the range 13≤n≤16, and orbital angular momenta =n2 and =n1. A closedform analytic expression is derived for the contribution of highenergy photons, valid for any state with ≥2 and arbitrary n, , and total angular momentum j. The lowenergy ...
Low Energy (E,2e) Studies From Ch₄: Results From Symmetric Coplanar Experiments And Molecular ThreeBody Distorted Wave Theory, Kate L. Nixon, Andrew James Murray, Hari Chaluvadi, Chuangang Ning, Don H. Madison
Low Energy (E,2e) Studies From Ch₄: Results From Symmetric Coplanar Experiments And Molecular ThreeBody Distorted Wave Theory, Kate L. Nixon, Andrew James Murray, Hari Chaluvadi, Chuangang Ning, Don H. Madison
Physics Faculty Research & Creative Works
Low energy experimental and theoretical triply differential cross sections are presented for electron impact ionization of methane (CH_{4}) for both the highest occupied molecular orbital (HOMO) and next highest occupied molecular orbital (NHOMO). The HOMO is a predominantly ptype orbital which is labeled 1t_{2} and the NHOMO is predominantly stype labeled 2a _{1}. Coplanar symmetric (symmetric both in final state electron energies and observation angles) are presented for final state electron energies ranging from 2.5 to 20 eV. The theoretical M3DW (molecular threebody distorted wave) results are in surprisingly good agreement with experiment for the HOMO state ...
Relativistic TightBinding Model: Application To Pt Surfaces, Aleksandr V. Chernatynskiy, J. Woods Halley
Relativistic TightBinding Model: Application To Pt Surfaces, Aleksandr V. Chernatynskiy, J. Woods Halley
Physics Faculty Research & Creative Works
We report a parametrization of a previous selfconsistent tightbinding model, suitable for metals with a high atomic number in which nonscalarrelativistic effects are significant in the electron physics of condensed phases. The method is applied to platinum. The model is fitted to density functional theory band structures and cohesive energies and spectroscopic data on platinum atoms in five oxidation states, and is then shown without further parametrization to correctly reproduce several low index surface structures. We also predict reconstructions of some vicinal surfaces.
HydrogenDeuterium Isotope Shift: From The 1s2sTransition Frequency To The ProtonDeuteron ChargeRadius Difference, Ulrich D. Jentschura, Arthur N. Matveev, Christian G. Parthey, Janis Alnis, Randolf Pohl, Th H. Udem, Nikolai N. Kolachevsky, Theodor Wolfgang Hansch
HydrogenDeuterium Isotope Shift: From The 1s2sTransition Frequency To The ProtonDeuteron ChargeRadius Difference, Ulrich D. Jentschura, Arthur N. Matveev, Christian G. Parthey, Janis Alnis, Randolf Pohl, Th H. Udem, Nikolai N. Kolachevsky, Theodor Wolfgang Hansch
Physics Faculty Research & Creative Works
We analyze and review the theory of the hydrogendeuterium isotope shift for the 1S2S transition, which is one of the most accurately measured isotope shifts in any atomic system, in view of a recently improved experiment. A tabulation of all physical effects that contribute to the isotope shift is given. These include the Dirac binding energy, quantum electrodynamic effects, including recoil corrections, and the nuclearsize effect, including the pertaining relativistic and radiative corrections. From a comparison of the theoretical result Δf_{th}=670999566.90(66)(60)kHz (exclusive of the nonrelativistic nuclearfinitesize correction) and the experimental result Δf_{expt}=670994334605 ...
Tracing The Redshift Evolution Of Hubble Parameter With GravitationalWave Standard Sirens, Atsushi J. Nishizawa, Atsushi Taruya, Shun Saito
Tracing The Redshift Evolution Of Hubble Parameter With GravitationalWave Standard Sirens, Atsushi J. Nishizawa, Atsushi Taruya, Shun Saito
Physics Faculty Research & Creative Works
Proposed spacebased gravitationalwave detectors such as BBO and DECIGO can detect ~ 10^{6} neutron star (NS) binaries and determine the luminosity distance to the binaries with high precision. Combining the luminosity distance and electromagnetically derived redshift, one would be able to probe cosmological expansion out to high redshift. In this paper, we show that the Hubble parameter as a function of redshift can be directly measured with monopole and dipole components of the luminosity distance on the sky. As a result, the measurement accuracies of the Hubble parameter in each redshift bin up to z=1 are 314%, 1.58 ...
Manipulating Atomic Fragmentation Processes By Controlling The Projectile Coherence, Kisra N. Egodapitiya, Sachin D. Sharma, Ahmad Hasan, Aaron C. Laforge, Don H. Madison, Robert Moshammer, Michael Schulz
Manipulating Atomic Fragmentation Processes By Controlling The Projectile Coherence, Kisra N. Egodapitiya, Sachin D. Sharma, Ahmad Hasan, Aaron C. Laforge, Don H. Madison, Robert Moshammer, Michael Schulz
Physics Faculty Research & Creative Works
We have measured the scattering angle dependence of cross sections for ionization in p+H_{2} collisions for a fixed projectile energy loss. Depending on the projectile coherence, interference due to indistinguishable diffraction of the projectile from the two atomic centers was either present or absent in the data. This shows that, due to the fundamentals of quantum mechanics, the preparation of the beam must be included in theoretical calculations. The results have farreaching implications on formal atomic scattering theory because this critical aspect has been overlooked for several decades.
BlackbodyRadiation Correction To The Polarizability Of Helium, Mariusz Puchalski, Ulrich D. Jentschura, Peter J. Mohr
BlackbodyRadiation Correction To The Polarizability Of Helium, Mariusz Puchalski, Ulrich D. Jentschura, Peter J. Mohr
Physics Faculty Research & Creative Works
The correction to the polarizability of helium due to blackbody radiation is calculated near room temperature. A precise theoretical determination of the blackbody radiation correction to the polarizability of helium is essential for dielectric gas thermometry and for the determination of the Boltzmann constant. We find that the correction, for not too high temperature, is roughly proportional to a modified hyperpolarizability (twocolor hyperpolarizability), which is different from the ordinary hyperpolarizability of helium. Our explicit calculations provide a definite numerical result for the effect and indicate that the effect of blackbody radiation can be excluded as a limiting factor for dielectric ...