Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster Session II

A 26.42: Poster

Mittwoch, 8. März 2017, 17:00–19:00, P OG1

Coulomb- and quantum-corrected strong-field approximation — •Michael Klaiber¹, Jiří Daněk¹, Enderalp Yakaboylu², Karen Z. Hatsagortsyan¹, and Christoph H. Keitel¹ — ¹Max-Planck-Institut für Kernphysik, Heidelberg — ²IST Austria, Wien

Signatures of the Coulomb quantum corrections in the photoelectron momentum distribution during laser-induced ionization of atoms or ions in tunneling and multiphoton regimes are investigated analytically in the case of an 1D problem. Extended Coulomb corrected strong-field approximation (SFA) is applied, where the exact continuum state in the S-matrix is approximated by the eikonal Coulomb-Volkov state including quantum corrections. Although, without quantum 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 Coulomb-Volkov wave function with the bound state to remove the Coulomb singularity, as it was carried out in ARM theory, we calculate the matrix element via the saddle-point integration method by time as well as by coordinate which is avoiding the Coulomb singularity. The momentum shifts in the photoelectron momentum distribution with respect to the ARM-theory due to quantum corrections are analyzed for tunneling and multiphoton regimes.