An alternative Coulomb correction method for numerical study on spiderlike photoelectron momentum distributions

We formulate an analytically-corrected semiclassical rescattering model (AC-SRM) by including analytical correction terms of Coulomb interaction into the standard SRM theory. By using the simple but effective AC-SRM, we perform extensive numerical simulation of the spiderlike photoelectron momentum distributions (PMDs) of hydrogen atom ionized by intense laser pulse. It is shown that the spiderlike structure in the PMDs manifests a systematic shift along the transverse momentum direction upon considering the Coulomb action. This shift is deciphered with a phase map scheme and trajectory analysis, with the former being particularly powerful for the most important first interference minimum of the spiderlike feature. The simulation reveals that the proposed AC-SRM is physically transparent and its computational implementation is economical. In addition, we propose a physical picture of the Coulomb action as a phase increment of the initial longitudinal momentum of the ionized electron.