Strongfield ionization via a highorder Coulombcorrected strongfield approximation
Abstract
Signatures of the Coulomb corrections in the photoelectron momentum distribution during laserinduced ionization of atoms or ions in tunneling and multiphoton regimes are investigated analytically in the case of a onedimensional problem. A highorder Coulombcorrected strongfield approximation is applied, where the exact continuum state in the S matrix is approximated by the eikonal CoulombVolkov state including the secondorder corrections to the eikonal. Although without highorder corrections our theory coincides with the known analytical R matrix (ARM) theory, we propose a simplified procedure for the matrix element derivation. Rather than matching the eikonal CoulombVolkov wave function with the bound state as in the ARM theory to remove the Coulomb singularity, we calculate the matrix element via the saddlepoint integration method by time as well as by coordinate, and in this way avoiding the Coulomb singularity. The momentum shift in the photoelectron momentum distribution with respect to the ARM theory due to highorder corrections is analyzed for tunneling and multiphoton regimes. The relation of the quantum corrections to the tunneling delay time is discussed.
 Publication:

Physical Review A
 Pub Date:
 February 2017
 DOI:
 10.1103/PhysRevA.95.023403
 arXiv:
 arXiv:1609.07018
 Bibcode:
 2017PhRvA..95b3403K
 Keywords:

 Quantum Physics;
 Physics  Atomic Physics
 EPrint:
 Phys. Rev. A 95, 023403 (2017)