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Articles 691 - 720 of 1762
Full-Text Articles in Physical Sciences and Mathematics
Magnetic Excitations In The Spinel Compound Liₓ [Mn₁.₉₆ Li₀.₀₄] O₄ (X=0.2,0.6,0.8,1.0 ): How A Classical System Can Mimic Quantum Critical Scaling, Thomas Heitmann, Alexander Schmets, John Gaddy, Jagat Lamsal, Marcus Petrovic, Thomas Vojta, Wouter Montfrooij
Magnetic Excitations In The Spinel Compound Liₓ [Mn₁.₉₆ Li₀.₀₄] O₄ (X=0.2,0.6,0.8,1.0 ): How A Classical System Can Mimic Quantum Critical Scaling, Thomas Heitmann, Alexander Schmets, John Gaddy, Jagat Lamsal, Marcus Petrovic, Thomas Vojta, Wouter Montfrooij
Physics Faculty Research & Creative Works
We present neutron-scattering results on the magnetic excitations in the spinel compounds Lix [Mn1.96 Li0.04] O4 (x=0.2,0.6,0.8,1.0). We show that the dominant excitations below T~70K are determined by Mn ions located in clusters, and that these excitations mimic the dynamic scaling found in quantum critical systems that also harbor magnetic clusters, such as CeRu0.5 Fe1.5 Ge2. We argue that our results for this classical spinel compound suggest that the unusual response at low temperatures as observed in quantum critical systems that have been driven to criticality through substantial chemical doping is …
Precision Measurement Of The Hydrogen-Deuterium 1s-2s Isotope Shift, Christian G. Parthey, Arthur Matveev, Janis Alnis, Randolf Pohl, Thomas Udem, Ulrich D. Jentschura, Nikolai Kolachevsky, Theodor W. Hänsch
Precision Measurement Of The Hydrogen-Deuterium 1s-2s Isotope Shift, Christian G. Parthey, Arthur Matveev, Janis Alnis, Randolf Pohl, Thomas Udem, Ulrich D. Jentschura, Nikolai Kolachevsky, Theodor W. Hänsch
Physics Faculty Research & Creative Works
Measuring the hydrogen-deuterium isotope shift via two-photon spectroscopy of the 1S-2S transition, we obtain 670994334606(15) Hz. This is a 10-times improvement over the previous best measurement confirming its frequency value. a calculation of the difference of the mean square charge radii of deuterium and hydrogen results in r2d-r2 p=3.82007(65)fm2, a more than twofold improvement compared to the former value.
Four-Body Charge Transfer Processes In Heavy Particle Collisions, Allison L. Harris, Jerry Peacher, Michael Schulz, Don H. Madison
Four-Body Charge Transfer Processes In Heavy Particle Collisions, Allison L. Harris, Jerry Peacher, Michael Schulz, Don H. Madison
Physics Faculty Research & Creative Works
Fully differential cross sections (FDCS) for proton + helium single capture and transfer-excitation collisions are presented using the Four-Body Transfer-Excitation (4BTE) model. This is a first order perturbative model that allows for any two-particle interaction to be studied. For single capture, the effect of the projectile-nuclear term in the perturbation is examined. It is shown that inclusion of this term results in an unphysical minimum in the FDCS, but is required to correctly predict the magnitude of the experimental results. For transfer-excitation, the role of electron correlation in the target helium atom is studied, and shown to be unimportant in …
Recent Theoretical Progress In Treating Electron Impact Ionization Of Molecules, Ola A. Al-Hagan, Chuangang Ning, Kate L. Nixon, Andrew James Murray, Christopher J. Colyer, Mark A. Stevenson, B. Lohmann, Don H. Madison
Recent Theoretical Progress In Treating Electron Impact Ionization Of Molecules, Ola A. Al-Hagan, Chuangang Ning, Kate L. Nixon, Andrew James Murray, Christopher J. Colyer, Mark A. Stevenson, B. Lohmann, Don H. Madison
Physics Faculty Research & Creative Works
(e,2e) ionization differential cross sections are presented for several molecules. We will compare experimental results with theoretical calculations using the molecular three body distorted wave (M3DW) approximations for H 2, N2, H2O and Formic Acid (FA) using better wave-function for the molecules than we had in previous works. Generally, good agreement is found between the M3DW approach and experiments.
Separation Of Transitions With Two Quantum Jumps From Cascades, Ulrich D. Jentschura
Separation Of Transitions With Two Quantum Jumps From Cascades, Ulrich D. Jentschura
Physics Faculty Research & Creative Works
We consider the general scenario of an excited level | i 〉 of a quantum system that can decay via two channels: (i) via a single-quantum jump to an intermediate, resonant level | m 〉, followed by a second single-quantum jump to a final level | f 〉, and (ii) via a two-quantum transition to a final level | f 〉 . Cascade processes | i 〉 → | m 〉 → | f 〉 and two-quantum transitions | i 〉 → | m 〉 → | f 〉 compete (in the latter case, | m 〉 can be both …
Qed Corrections Of Order Α(Zα)²EF To The Hyperfine Splitting Of P1/2 And P3/2 States In Hydrogenlike Ions, Ulrich D. Jentschura, Vladimir A. Yerokhin
Qed Corrections Of Order Α(Zα)²EF To The Hyperfine Splitting Of P1/2 And P3/2 States In Hydrogenlike Ions, Ulrich D. Jentschura, Vladimir A. Yerokhin
Physics Faculty Research & Creative Works
The hyperfine structure (HFS) of a bound electron is modified by the self-interaction of the electron with its own radiation field. This effect is known as the self-energy correction. In this work, we discuss the evaluation of higher order self-energy corrections to the HFS of bound P states. These are expressed in a semianalytic expansion involving powers of Zα and ln(Zα), where Z is the nuclear charge number and α is the fine-structure constant. We find that the correction of relative order α (Zα)2 involves only a single logarithm ln(Zα) for P1/2 states [but no term of order …
Self-Energy Correction To The Bound-Electron G Factor Of P States, Ulrich D. Jentschura
Self-Energy Correction To The Bound-Electron G Factor Of P States, Ulrich D. Jentschura
Physics Faculty Research & Creative Works
The radiative self-energy correction to the bound-electron g factor of 2P1/2 and 2P3/2 states in one-electron ions is evaluated to order α(Zα)2. The contribution of high-energy virtual photons is treated by means of an effective Dirac equation, and the result is verified by an approach based on long-wavelength quantum electrodynamics. The contribution of low-energy virtual photons is calculated both in the velocity and in the length gauge, and gauge invariance is verified explicitly. The results compare favorably to recently available numerical data for hydrogenlike systems with low nuclear charge numbers.
Self-Energy Correction To The Hyperfine Splitting And The Electron G Factor In Hydrogenlike Ions, Vladimir A. Yerokhin, Ulrich D. Jentschura
Self-Energy Correction To The Hyperfine Splitting And The Electron G Factor In Hydrogenlike Ions, Vladimir A. Yerokhin, Ulrich D. Jentschura
Physics Faculty Research & Creative Works
The hyperfine structure (hfs) and the g factor of a bound electron are caused by external magnetic fields. For the hfs, the magnetic field is due to the nuclear spin. A uniform-in-space and constant-in-time magnetic field is used to probe the bound-electron g factor. The self-energy corrections to these effects are more difficult to evaluate than those to the Lamb shift. Here, we describe a numerical approach for both effects in the notoriously problematic regime of hydrogenlike bound systems with low nuclear charge numbers. The calculation is nonperturbative in the binding Coulomb field. Accurate numerical values for the remainder functions …
Fully Differential Cross Sections For The Single Ionization Of Argon By Positron Impact At Intermediate Energies, Sebastian Otranto, Ronald E. Olson
Fully Differential Cross Sections For The Single Ionization Of Argon By Positron Impact At Intermediate Energies, Sebastian Otranto, Ronald E. Olson
Physics Faculty Research & Creative Works
In this work, we present theoretical fully differential cross sections (FDCS) for the single ionization of argon by positron impact obtained by means of the CDW-EIS model. the impact energies considered are 113.5 eV and 200 eV. the obtained angular distributions for 2eV and 5 eV emitted electrons are compared to those obtained for electron impact under the same energetic configuration. in particular, we show that the shape of the binary structure evolves from a single peak to a two-peak structure as the projectile scattering angle is increased. Similar conclusions apply for the usually termed recoil peak structure.
1st And 2nd Order Contributions To The Double Ionization Of Argon Resulting From Positron And Electron Impact, Robert D. Dubois, O. G. De Lucio, J. Gavin
1st And 2nd Order Contributions To The Double Ionization Of Argon Resulting From Positron And Electron Impact, Robert D. Dubois, O. G. De Lucio, J. Gavin
Physics Faculty Research & Creative Works
Angular dependences for electron emission resulting from single and double ionization of argon are presented for 200, 500, and 1000 eV positron and electron impact. from these data, double to single ionization ratios are determined as a function of the emission direction. at each impact energy, these ratios have different angular dependences positive and negative particle impact. the positron and electron induced ratios are analyzed to provide information about how first- and second-order double ionization mechanisms interfere and contribute to the differential electron emission.
Single Ionization Of Ne, Ar And Kr By Proton Impact: Single Differential Distributions In Energy And Angle, Sebastian Otranto, J. E. Miraglia, Ronald E. Olson
Single Ionization Of Ne, Ar And Kr By Proton Impact: Single Differential Distributions In Energy And Angle, Sebastian Otranto, J. E. Miraglia, Ronald E. Olson
Physics Faculty Research & Creative Works
Synopsis in this work we present a theoretical study of singly differential cross sections in energy and angle for the single ionization of neon, argon and krypton by proton impact. Theoretical results obtained by means of the Continuum Distorted Wave-Eikonal initial state (CDW-EIS) model are compared to those provided by the First-Born Approximation (FBA) and the classical trajectory Monte Carlo (CTMC) method as well as to experimental data from several laboratories. We note in particular for argon, that the CDW-EIS model does not reproduce the experimental data as accurately as expected, while the CTMC instead is in very good agreement.
Exploring Differences Of Atomic And Molecular Ionization By Electron Impact, X. Ren, A. Senftleben, T. Pflüger, A. Dorn, I. Bray, D. V. Fursa, J. Colgan, M. S. Pindzola, O. Al-Hagan, Don H. Madison, J. Ullrich
Exploring Differences Of Atomic And Molecular Ionization By Electron Impact, X. Ren, A. Senftleben, T. Pflüger, A. Dorn, I. Bray, D. V. Fursa, J. Colgan, M. S. Pindzola, O. Al-Hagan, Don H. Madison, J. Ullrich
Physics Faculty Research & Creative Works
Electron impact single ionization of helium and the hydrogen molecule is studied at equivalent electron kinematics to explore the differences of atomic and molecular ionization. Fully differential cross sections (FDCS) were obtained covering the whole solid angle in order to critically test theoretical calculations.
Longitudinal Recoil Ion Momentum Distributions For Proton-Argon Ionizing Collisions At Intermediate Energies, S. Otranto, Ronald E. Olson
Longitudinal Recoil Ion Momentum Distributions For Proton-Argon Ionizing Collisions At Intermediate Energies, S. Otranto, Ronald E. Olson
Physics Faculty Research & Creative Works
Synopsis Proton-argon ionizing collisions at intermediate energies are studied by means of the classical trajectory Monte Carlo method (CTMC). in particular, we focus on the longitudinal and transverse recoil momentum distributions for the process. We compare the profile of the longitudinal momentum distribution at the abrupt rise region corresponding to the electron capture to the continuum (ECC) processes, with those obtained for simpler targets like H and He. Selected subsets of the data show that the recoiling multielectronic ion plays a major role in the low energy electron emission, influencing the angular asymmetry of the electronic emission.
New Double Ionization Channel Uncovered In Four-Particle Dalitz Plots, Michael Schulz, M. F. Ciappina, T. Kirchner, D. Fischer, R. Moshammer, J. Ullrich
New Double Ionization Channel Uncovered In Four-Particle Dalitz Plots, Michael Schulz, M. F. Ciappina, T. Kirchner, D. Fischer, R. Moshammer, J. Ullrich
Physics Faculty Research & Creative Works
Synopsis Double ionization in 6 MeV p + He collisions was analyzed in terms of 4-particle Dalitz plots.
Triply Differential Measurements For 200 Ev E⁺-And E--Ar Collisions, O. G. De Lucio, Robert D. Dubois
Triply Differential Measurements For 200 Ev E⁺-And E--Ar Collisions, O. G. De Lucio, Robert D. Dubois
Physics Faculty Research & Creative Works
Triply differential single ionization yields for projectile scattering and electron emission are presented for 200 eV positron and electron impact ionization of argon. the projectile scattering and the electron emission are observed to be different for positron and electron impact.
Electron Impact Ionization And Fragmentation Of C2h2, A. C.F. Santos, Robert D. Dubois, E. C. Montenegro
Electron Impact Ionization And Fragmentation Of C2h2, A. C.F. Santos, Robert D. Dubois, E. C. Montenegro
Physics Faculty Research & Creative Works
Ionization and fragmentation of C2H2 resulting from 750 eV electron impact is measured as a function of electron loss. Electron losses up to 400 eV are investigated. the interaction kinematics are investigated by measuring ejected electron-C2H2+ ion-scattered projectile coincidences and generating triply and doubly differential yields for the electron emission and projectile scattering respectively.
Theoretical & Experimental (E,2e) Studies For Electron Impact Ionization Of Argon Measured In The Perpendicular Plane, Ola Al-Hagan, Christian Kaiser, Andrew Murray, Don H. Madison
Theoretical & Experimental (E,2e) Studies For Electron Impact Ionization Of Argon Measured In The Perpendicular Plane, Ola Al-Hagan, Christian Kaiser, Andrew Murray, Don H. Madison
Physics Faculty Research & Creative Works
FDCS for electron impact ionization of the Argon atom with equal energy outgoing electrons ranging from 1 eV to 25 eV are studied in the perpendicular plane.
Theoretical Fully Differential Cross Sections For Transfer-Excitation Collisions, A. L. Harris, Jerry Peacher, Michael Schulz, Don H. Madison
Theoretical Fully Differential Cross Sections For Transfer-Excitation Collisions, A. L. Harris, Jerry Peacher, Michael Schulz, Don H. Madison
Physics Faculty Research & Creative Works
Synopsis Transfer-excitation calculations from a full four-body theoretical model will be compared with experiment.
Double Differential Projectile Angular Distributions For Single Ionization Of Atomic Hydrogen By 75 Kev Proton Impact, A. C. Laforge, K. Egodapitiya, J. S. Alexander, A. Hasan, Michael Schulz
Double Differential Projectile Angular Distributions For Single Ionization Of Atomic Hydrogen By 75 Kev Proton Impact, A. C. Laforge, K. Egodapitiya, J. S. Alexander, A. Hasan, Michael Schulz
Physics Faculty Research & Creative Works
Synopsis Doubly differential cross sections (DDCSp) for single ionization of atomic hydrogen by 75-keV proton impact as a function of the projectile scattering angle and energy loss have been measured.
Minima In The Triple Differential Cross Sections For The Electron-Impact Ionization Of Helium, J. Colgan, C. Kaiser, A. J. Murray, O. Al-Hagan, Don H. Madison, M. S. Pindzola
Minima In The Triple Differential Cross Sections For The Electron-Impact Ionization Of Helium, J. Colgan, C. Kaiser, A. J. Murray, O. Al-Hagan, Don H. Madison, M. S. Pindzola
Physics Faculty Research & Creative Works
We examine unusual minima found in the triple differential cross sections for the electron-impact ionization of helium for configurations where the incident electron is out-of-plane with respect to the plane in which the outgoing electrons are detected. the position of the experimentally determined minima are confirmed by time-dependent close-coupling calculations. an analysis is made of the origin of the minima in the cross section, where it is found they are due to deep destructive interference between the partial-wave amplitudes which contribute to the differential cross section.
Single And Multiple Projectile Electron-Loss And Capture Of Low Charge States Of Oxygen Beams Colliding With The Methane Molecule, A. C.F. Santos, M. M. Sant'anna, W. Wolff, G. M. Sigaud, E. C. Montenegro, Robert D. Dubois
Single And Multiple Projectile Electron-Loss And Capture Of Low Charge States Of Oxygen Beams Colliding With The Methane Molecule, A. C.F. Santos, M. M. Sant'anna, W. Wolff, G. M. Sigaud, E. C. Montenegro, Robert D. Dubois
Physics Faculty Research & Creative Works
The projectile electron loss and capture are important ionization components collision channels in dressed ion-atom and ion-molecule collisions. They play important roles in several processes connected to the penetration of neutral and charged projectiles in gases, in radiation damage and upper atmospheric physics. in this work, cross sections for total single and multiple electron loss and capture of O-, Oo, O+, O2+ projectiles impinging on the methane molecule were measured in the 15 keV ≤ E ≤ 1000 keV energy range. in addition, an extended version of the free-collision model was employed for the calculation …
Four-Body Model For Transfer Excitation, Allison L. Harris, Jerry Peacher, Don H. Madison, James Colgan
Four-Body Model For Transfer Excitation, Allison L. Harris, Jerry Peacher, Don H. Madison, James Colgan
Physics Faculty Research & Creative Works
We present here a four-body model for transfer-excitation collisions, which we call the four-body transfer-excitation (4BTE) model. Each two-body interaction is explicitly included in the 4BTE model, allowing us to study the effects of individual two-body interactions. We apply our model to fully differential cross sections for proton+helium collisions, and study the effect of the incident projectile-atom interaction, the scattered projectile-ion interaction, the projectile-nuclear interaction, and electron correlation within the target atom.
Systematic Analysis Of Double-Ionization Dynamics Based On Four-Body Dalitz Plots, Daniel Fischer, Michael Schulz, Katharina R. Schneider, Marcelo F. Ciappina, Tom Kirchner, Aditya H. Kelkar, S. Hagman, Manfred Grieser, Kai Uwe Kuhnel, Robert Moshammer, Joachim Hermann Ullrich
Systematic Analysis Of Double-Ionization Dynamics Based On Four-Body Dalitz Plots, Daniel Fischer, Michael Schulz, Katharina R. Schneider, Marcelo F. Ciappina, Tom Kirchner, Aditya H. Kelkar, S. Hagman, Manfred Grieser, Kai Uwe Kuhnel, Robert Moshammer, Joachim Hermann Ullrich
Physics Faculty Research & Creative Works
We report on an experimental and theoretical systematic study of double ionization of helium by ion impact in terms of four-particle Dalitz plots. Several collision systems covering abroad range of perturbation parameters η (projectile charge to speed ratio) were investigated. With increasing η we observe a systematic trend from features, characteristic to correlated double-ionization mechanisms, to signatures of higher-order processes not requiring electron-electron correlations [the mechanism called "two-step-two projectile-electron interaction" (TS-2)]. The data for the largest η can qualitatively be amazingly well described by a simple model only including the TS-2 mechanism.
(E,2e) Study Of Two-Center Interference Effects In The Ionization Of N₂, Leigh R. Hargreaves, Christopher J. Colyer, Mark A. Stevenson, B. Lohmann, Ola A. Al-Hagan, Don H. Madison, Chuangang Ning
(E,2e) Study Of Two-Center Interference Effects In The Ionization Of N₂, Leigh R. Hargreaves, Christopher J. Colyer, Mark A. Stevenson, B. Lohmann, Ola A. Al-Hagan, Don H. Madison, Chuangang Ning
Physics Faculty Research & Creative Works
A number of previous studies have suggested the possibility of two-center interference effects in the single ionization of diatomic molecules such as H2 and N2. While interference effects have been successfully observed in the ionization of H2, to date evidence for interference in N2 ionization has yet to be conclusively demonstrated. This study presents triply differential cross sections for electron impact ionization of N2, measured using the (e,2e) technique. The data are probed for signatures of two-center interference effects. Evidence for interference manifesting in the cross sections is observed.
Nonlinear Evolution Of Baryon Acoustic Oscillations From Improved Perturbation Theory In Real And Redshift Spaces, Atsushi Taruya, Takahiro Nishimichi, Shun Saito, Takashi Hiramatsu
Nonlinear Evolution Of Baryon Acoustic Oscillations From Improved Perturbation Theory In Real And Redshift Spaces, Atsushi Taruya, Takahiro Nishimichi, Shun Saito, Takashi Hiramatsu
Physics Faculty Research & Creative Works
We study the nonlinear evolution of baryon acoustic oscillations in the matter power spectrum and correlation function from the improved perturbation theory (PT). Based on the framework of renormalized PT, which provides a nonperturbative way to treat the gravitational clustering of large-scale structure, we apply the closure approximation that truncates the infinite series of loop contributions at one-loop order, and obtain a closed set of integral equations for power spectrum and nonlinear propagator. The resultant integral expressions are basically equivalent to those previously derived in the form of evolution equations, and they keep important nonperturbative properties which can dramatically improve …
Nuclear Form Factor, Validity Of The Equivalent Photon Approximation And Coulomb Corrections To Muon Pair Production In Photon-Nucleus And Nucleus-Nucleus Collisions, Ulrich D. Jentschura, V. G. Serbo
Nuclear Form Factor, Validity Of The Equivalent Photon Approximation And Coulomb Corrections To Muon Pair Production In Photon-Nucleus And Nucleus-Nucleus Collisions, Ulrich D. Jentschura, V. G. Serbo
Physics Faculty Research & Creative Works
We study in detail the influence of the nuclear form factor both on the Born cross section and on the Coulomb corrections to the photo-production of muon pairs off heavy nuclei (γ Z→μ + μ - Z) and in heavy-ion collisions (ZZ→ZZ μ + μ -). Our findings indicate a number of issues which have not been sufficiently described as yet in the literature: (i) the use of a realistic form factor, based on the Fermi charge distribution for the nucleus, is absolutely indispensable for reliable theoretical predictions; (ii) we checked quantitatively that the equivalent photon approximation has a very …
Search For High Frequency Gravitational-Wave Bursts In The First Calendar Year Of Ligo's Fifth Science Run, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Search For High Frequency Gravitational-Wave Bursts In The First Calendar Year Of Ligo's Fifth Science Run, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present an all-sky search for gravitational waves in the frequency range 1 to 6 kHz during the first calendar year of LIGO's fifth science run. This is the first untriggered LIGO burst analysis to be conducted above 3 kHz. We discuss the unique properties of interferometric data in this regime. 161.3 days of triple-coincident data were analyzed. No gravitational events above threshold were observed and a frequentist upper limit of 5.4 year-1 on the rate of strong gravitational-wave bursts was placed at a 90% confidence level. Implications for specific theoretical models of gravitational-wave emission are also discussed.
Search For Gravitational-Wave Bursts In The First Year Of The Fifth Ligo Science Run, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Search For Gravitational-Wave Bursts In The First Year Of The Fifth Ligo Science Run, Benjamin P. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.
Physics Faculty Research & Creative Works
We present the results obtained from an all-sky search for gravitational-wave (GW) bursts in the 64-2000 Hz frequency range in data collected by the LIGO detectors during the first year (November 2005-November 2006) of their fifth science run. The total analyzed live time was 268.6 days. Multiple hierarchical data analysis methods were invoked in this search. The overall sensitivity expressed in terms of the root-sum-square (rss) strain amplitude hrss for gravitational-wave bursts with various morphologies was in the range of 6 x 10-22 Hz -1/2 to a few x 10-21Hz-1/2. No GW signals were …
Analysis Of Angular Dependence Of Strong-Field Tunneling Ionization For Co₂, Song-Feng Zhao, Cheng Jin, Anh-Thu Le, T. F. Jiang, C. D. Lin
Analysis Of Angular Dependence Of Strong-Field Tunneling Ionization For Co₂, Song-Feng Zhao, Cheng Jin, Anh-Thu Le, T. F. Jiang, C. D. Lin
Physics Faculty Research & Creative Works
We analyzed the discrepancy of the angular dependence of strong-field ionization for CO₂ among the different theoretical calculations and experiments. Using a more accurate ground-state wave function of CO₂ in the asymptotic region, we showed that the accuracy in the earlier tunneling ionization theory of Tong et al. [Phys. Rev. A 66, 033402 (2002)] is much improved. We also concluded that the angular dependence deduced from the experiment of Pavicic [Phys. Rev. Lett. 98, 243001 (2007)] appears to be too narrowly distributed.
Correlated Two-Photon Emission By Transitions Of Dirac-Volkov States In Intense Laser Fields: Qed Predictions, Erik Lotstedt, Ulrich D. Jentschura
Correlated Two-Photon Emission By Transitions Of Dirac-Volkov States In Intense Laser Fields: Qed Predictions, Erik Lotstedt, Ulrich D. Jentschura
Physics Faculty Research & Creative Works
In an intense laser field, an electron may decay by emitting a pair of photons. The two photons emitted during the process, which can be interpreted as a laser-dressed double Compton scattering, remain entangled in a quantifiable way: namely, the so-called concurrence of the photon polarizations gives a gauge-invariant measure of the correlation of the hard gamma rays. We calculate the differential rate and concurrence for a backscattering setup of the electron and photon beam, employing Volkov states and propagators for the electron lines, thus accounting nonperturbatively for the electron-laser interaction. The nonperturbative results are shown to differ significantly compared …