We present a detailed experimental and theoretical study on the relativistic nondipole effects in strong-field atomic ionization by near-infrared linearly polarized few-cycle laser pulses in the intensity range of 10^{14}-10^{15} W/cm^{2}. We record high-resolution photoelectron momentum distributions of argon using a reaction microscope and compare our measurements with a truly ab initio fully relativistic 3D model based on the time-dependent Dirac equation. We observe counterintuitive peak shifts of the transverse electron momentum distribution in the direction opposite to that of laser propagation as a function of laser intensity and demonstrate an excellent agreement between the experimental results and theoretical predictions.
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http://dx.doi.org/10.1103/PhysRevLett.123.093201 | DOI Listing |
Sci Rep
November 2021
Center for Relativistic Laser Science, Institute for Basic Science, Gwangju, 61005, Korea.
We study propagation effects due to the finite speed of light in ionization of extended molecular systems. We present a general quantitative theory of these effects and show under which conditions such effects should appear. The finite speed of light propagation effects are encoded in the non-dipole terms of the time-dependent Shrödinger equation and display themselves in the photoelectron momentum distribution projected on the molecular axis.
View Article and Find Full Text PDFPhys Rev Lett
August 2019
Centre for Quantum Dynamics, Griffith University, Brisbane, Queensland 4111, Australia.
J Phys Chem A
October 2018
Department of Physics , National Taiwan University, Taipei 10106 , Taiwan.
We perform a theoretical and computational study of relativistic one-electron homonuclear diatomic quasimolecules subject to strong electromagnetic fields linearly polarized along the molecular axis. Several quasimolecules with the nuclear charges 1-92 and appropriately scaled internuclear distances and field parameters are used in the calculations. The time-dependent Dirac equation is solved with the help of the generalized pseudospectral method in prolate spheroidal coordinates.
View Article and Find Full Text PDFPhys Chem Chem Phys
November 2016
Department of Chemistry, University of Isfahan, Isfahan 81746-73441, Islamic Republic of Iran.
A theoretical study is carried out on the effect of non-dipole interactions on the electron spin dynamics in the asymmetric diatomic HeH in its first excited state in intense linearly polarized laser fields. The Foldy-Wouthuysen transformation is used to solve the Dirac equation numerically without BOA. Effects of the phase of the laser pulse and alignment of the molecule on the relativistic characteristics, such as the pure spin and the pure spin-orbit current densities, spin-orbit force and spin torque, are investigated.
View Article and Find Full Text PDFPhys Rev E Stat Nonlin Soft Matter Phys
September 2008
Petersburg Nuclear Physics Institute, Gatchina 188300, Russia.
On the basis of the fully relativistic Dirac-Fock treatment of photoionization and radiative recombination processes with regard to all multipoles of the radiative field, we have assessed the influence of nondipole effects on the radiative recombination rate coefficients. A formula for the rate coefficient has been derived using the relativistic Maxwell-Boltzmann distribution of continuum electrons instead of the commonly used nonrelativistic distribution. This decreases the recombination rate coefficient considerably in hot thermal plasmas.
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