Stimulated Compton Scattering in Two-Color Ionization of Hydrogen with keV Electromagnetic Fields

Bachau, H.; Dondera, M.; Florescu, Viorica

doi:10.1103/physrevlett.112.073001

Cited by 31 publications

(28 citation statements)

References 19 publications

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“…The conclusion of this study is that, if the contribution of A 2 is non-negligible, the nondipole correction mainly comes from the term A • P. Incidentally, we notice that the nondipole diamagnetic term A 2 plays a crucial role in nonlinear processes like stimulated Compton Scattering [23] and stimulated Raman Scattering [24]. Analytical approaches, theory and methodologies of the TDSE in the framework of ab initio calculations, with a particular focus on dynamical effects induced by the A 2 term, can be found in [25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 64%

Nondipole effects in helium ionization by intense soft x-ray laser pulses

Bachau

Dieng

2019

Eur. Phys. J. D

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We consider the helium atom exposed to laser pulses in soft-x regime at intensities of the order of 10 17 − 10 20 W/cm 2. Two cases are investigated, first a pulse with a central frequency of 20 a.u. (∼ 544.2 eV) and a pulse with a central frequeny of 50 a.u. (∼ 1.36 keV). We solve the time-dependent Schrödinger equation (TDSE), nondipole (retardation) effects are included up to O(1/c) (c being the velocity of light). We study the single photoionization of helium with a focus on nondipole effects. We calculate the total and partial photoelectron energy spectra, and the photoelectron angular distributions. The nondipole effects associated with the A • P and A 2 coupling terms in the Hamiltonian (A denoting the vector potential of the field and P the momentum operator) are thoroughly analyzed in the region of one-photon resonance. We show that the nondipole contribution associated with A • P varies linearly with the intensity I while a three-photon transition involving A 2 increases like I 3 , in agreement with lowest order perturbation theory (LOPT). At high intensities these contributions compete and the nondipole transition becomes nonlinear. The physical mechanisms associated with nondipole couplings are discussed, as well as their effects on photoelectron energy and angular distributions. PACS. PACS-key discribing text of that key-PACS-key discribing text of that key

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Section: Introductionmentioning

confidence: 64%

Nondipole effects in helium ionization by intense soft x-ray laser pulses

Bachau

Dieng

2019

Eur. Phys. J. D

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“…• Time-Dependent Schrödinger Equation: In later papers Bachau and co-workers [67][68][69] have computed the stimulated Raman and Compton scattering cross-sections, but these do not use the approach they have applied in their ATI cross-section calculations. Instead these scattering crosssections are calculated using either the analytic expressions derived by Gavrila et al or by solving the time-dependent Schrödinger equation.…”

Section: Above Thresholdmentioning

confidence: 99%

A pseudostate method for computing photon-atom scattering cross-sections

Grunefeld¹

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A computational method is developed for photon-atom scattering cross-sections given by the p • A interaction, which dominates scattering at low frequencies. Our method is simple and intuitive, and has the advantage of being extremely adaptable-it can be extended to higher-order scattering processes and applied to any atom. The scattering cross-sections calculated in this thesis provide a more complete picture of the photon-atom interaction than is currently available, which is useful for high-precision atomic, molecular and optical (AMO) experiments and has applications in astrophysics and spectroscopy.

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“…Recent experimental activity in the field has already provided valuable new insight into this emerging area of research [1][2][3][4][5][6][7][8][9]. The theoretical modeling of the laser-matter interaction in the intense field regime is particularly challenging, primarily due to the fact that the celebrated dipole approximation is generally no longer applicable [10][11][12][13][14][15]. Furthermore, in the limit of very strong fields the validity of the usual nonrelativistic approximation ultimately breaks down and a relativistic treatment of the laser-matter interaction becomes necessary [16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Schrödinger formulation of the nondipole light-matter interaction consistent with relativity

Førre

Selstø

2020

Phys. Rev. A

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An alternative and powerful Schrödinger-like equation for describing beyond dipole laser-matter interactions is derived. It is shown that this particular formulation is numerically very efficient with respect to computational effort and convergence rate of the solutions. Furthermore, and more importantly, its nonrelativistic form turns out to be more compatible with relativity than what seems to be the case with the more common formulations of the nonrelativistic light-matter interaction. Moreover, an extension of this interaction form into the relativistic region preserves, to a large extent, the numerical efficiency.

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Stimulated Compton Scattering in Two-Color Ionization of Hydrogen with keV Electromagnetic Fields

Cited by 31 publications

References 19 publications

Nondipole effects in helium ionization by intense soft x-ray laser pulses

Nondipole effects in helium ionization by intense soft x-ray laser pulses

A pseudostate method for computing photon-atom scattering cross-sections

Schrödinger formulation of the nondipole light-matter interaction consistent with relativity

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