Open AccessTime-dependent perturbation theory beyond the dipole approximation for two-photon ionization of atoms
Author(s) -
M. Wang,
Hao Liang,
Xue Xiao,
S. Chen,
Liang-You Peng
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1412/15/152004
Subject(s) - ionization , physics , atomic physics , dipole , photon , polarization (electrochemistry) , perturbation theory (quantum mechanics) , photoionization , laser , discrete dipole approximation , perturbation (astronomy) , quantum electrodynamics , quantum mechanics , ion , chemistry
Synopsis We develop a time-dependent perturbation theory beyond the dipole approximation to analyze the two-photon ionization dynamics of atoms exposed to short laser pulses with an arbitrary polarization. Subse-quent applications of the PT method in the nonresonant regime allow us to analyze one of the most important nondipole effects, i.e., the linear-momentum-transfer law in the two-photon ionization process and to unveil the important role of the interferences between the dipole and nondipole transition pathways to the photoelectron momentum shift along the laser-propagation direction.