Longitudinal photoelectron momentum shifts induced by absorbing a single XUV photon in diatomic molecules

Lao, Di; He, Pei-Lun; He, Feng

doi:10.1103/physreva.93.063403

Cited by 16 publications

(9 citation statements)

References 41 publications

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“…What is also shown in Fig. 3 is the prediction of the independent atom model [34] for the 1sσ g . For the independent atom approximation, the final PMD is simply obtained by coherently adding PMDs from two hydrogen atoms with a phase factor e iqR cos θe .…”

Section: Resultssupporting

confidence: 57%

“…1(d), we can see that the results for all the three configurations are oscillating around that of the atomic case q a = 1.6αE [3]. Apparently, the oscillation is mainly due to the two-center interference effect of the molecule, which has been discussed recently using an independent atom model [34]. Approximately, there will be a phase difference of qR cos θ e between photoelectrons with a momentum q ionized from the two different nuclei, where θ e is the angle between the photoelectron momentum and molecular axis.…”

Section: Resultsmentioning

confidence: 56%

“…However, most of previous work focused on the momentum transfer in atomic systems. Very recently, based on an independent atom approximation, Lao et al [34] used the time-dependent perturbation theory to investigate the interference effect in diatomic molecules to the momentum transfer by absorbing one photon. For laser sources with wavelengths in the infrared regime, Chelkowski and Bandrauk [35] studied the two-center effects and the dependence of ellipticity of the laser pulse, by solving TDSE in the Cartesian coordinates with a soft-core Coulomb potential.…”

Section: Introductionmentioning

confidence: 99%

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Photon-momentum transfer in diatomic molecules: An ab initio study

et al. 2018

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For a molecule, the two-center interference and the molecular scattering phase of the electron are important for almost all the processes that may occur in a laser field. In this study, we investigate their effects in the transfer of linear photon momentum to the ionized electron by absorbing a single photon. The time-dependent Schrödinger equation of H + 2 is numerically solved in the multipolar gauge in which the electric quadrupole term and the magnetic dipole term are explicitly expressed. This allows us to separate the contributions of the two terms in the momentum transfer. For different configurations of the molecular and the laser orientation, the transferred momentum to the electron is evaluated at different internuclear distances with various photon energies and two-center interferences are identified in the whole region. At small electron energies and small internuclear distances, we find significant deviations from the prediction of the classical double-slit model due to the strong mediation of the Coulomb potential. Finally, even for a large internuclear distance, our results show that a varying molecular scattering phase is important at all electron energies, which is beyond the simple prediction of the linear combination of the atomical orbitals.

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Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

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Photon-momentum transfer in diatomic molecules: An ab initio study

et al. 2018

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“…Recently, several theoretical studies discussed the nondipole asymmetrical angular distributions [17,[35][36][37][38][39]. A related topic is the photon-momentum transfer and partition in the atomic and molecular ionization [40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56].…”

Section: Introductionmentioning

confidence: 99%

Nondipole effects in atomic dynamic interference

et al. 2018

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Nondipole effects in the atomic dynamic interference are investigated by numerically solving the time-dependent Schrödinger equation (TDSE) of hydrogen. It is found that the inclusion of nondipole corrections in the TDSE can induce momentum shifts of photoelectrons in the opposite direction of the laser propagation. The magnitude of the momentum shift is roughly proportional to the laser peak intensity and to the momentum component of the photoelectron along the laser propagation. By including the nondipole corrections of the Volkov phase into a semi-analytical model previously developed under the dipole approximation, all the main features of the momentum shifts can be nicely reproduced. Through an analytic expression, the origin of such momentum shifts is attributed to the nondipole phase difference between the two electron wave packets ejected in the rising edge and the falling edge, which will interfere with each other and result in the final fringe pattern. One important consequence of such momentum shifts is that they can smooth out the peak splitting induced by the dynamic interference in the photoelectron energy spectrum. Nevertheless, it should be emphasized that the dynamic interference persists in the photoelectron momentum distributions and is not suppressed at all for the laser parameters considered in this work.

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“…Some characters of the longitudinal momentum shift [15][16][17][18][19][20] were explored by calculations of strong field approximation (SFA). Though it is well recognized that the longitudinal momentum shift must be due to the nondipole laser-atom coupling, the exact nondipole Volkov solution was not built in these studies.…”

mentioning

confidence: 99%