Theoretical studies of the long-range Coulomb potential effect on photoionization by strong lasers
Journal
Physical Review A - Atomic, Molecular, and Optical Physics
Journal Volume
66
Journal Issue
053408
Pages
053408-1 - 053408-10
Date Issued
2002
Author(s)
Abstract
Using the second-order Coulomb-corrected Volkov function as a continuum state, we derive quantum mechanically analytical formulas for the photoionization rate of hydrogen atoms irradiated by a linearly polarized electric field in the tunneling regime. From the analytical formula is directly drawn the important conclusion that the role of the first-order Coulomb correction is to reduce the ionization potential. As a result, the photoionization rate is enhanced compared with that in the absence of the Coulomb correction. In addition, the second-order correction modifies the Keldysh parameter, decreases the binding energy, and increases the photoionization rates relative to those of the first-order Coulomb correction. We estimate the effects of the respective Coulomb corrections on the resonance structure of the photoionization rate, Keldysh parameter, and ponderomotive energy.
SDGs
Type
journal article