# Osnabrück 2002 – wissenschaftliches Programm

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# MO: Molekülphysik

## MO 15: Photoionisation II (gemeinsam mit FV Atomphysik)

### MO 15.1: Vortrag

### Donnerstag, 7. März 2002, 14:00–14:15, HS 15/E10

**A comparison of theory and experiment in strong-field ionization of Argon** — •R. Wiehle^{1}, V. Schyja^{1}, H. Helm^{1}, B. Witzel^{1}, and E. Cormier^{2} — ^{1}Department of Molecular and Optical Physics, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Strasse 3, 79104 Freiburg — ^{2}Univ Bordeaux 1, CELIA, F-33400 Talence, France

Momentum distributions of photoelectrons formed from Argon gas exposed to
80fs pulses of a Ti:Sapphire laser are compared with numerical solutions of
the time-dependent Schrödinger equation. The theory treats the
one-electron problem in an empirical potential which precisely reproduces
the stationary one-electron excited states of the argon atom[1]. A
realistic spatial and temporal distribution of laser intensities in the
focal volume is accounted for by the theory and the experimental counting
efficiency is explicitly included in the comparison. At intensities ranging
from 2*x*10^{13} to 7*x*10^{13} *W*/*cm*^{2} the experimental distributions
reveals complex angular patterns with a strong variation with intensity.
All features in the spectra are precisely reproduced by theory. The project
is supported by SFB 276-C14

[1] J PHYS B-AT MOL OPT 34,2001,L9