Dresden 2011 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 12: Femtosecond Spectroscopy III
MO 12.4: Vortrag
Mittwoch, 16. März 2011, 11:15–11:30, TOE 317
Polarization control in two-color above-threshold ionization of small molecules — •Torsten Leitner1, Mateusz Ibek1, Michael Meyer2, and Philippe Wernet1 — 1Institute for Methods and Instrumentation for Synchrotron Radiation Research, Helmholtz-Zentrum Berlin — 2European XFEL, Hamburg
The high-harmonic generation (HHG) setup at HZB provides high peak power ultrashort femtosecond VUV pulses. Two-color multiphoton ionization of atoms and small molecules was investigated by combining these VUV pulses with an optical laser. In the photoelectron spectrum, on both sides of the main line associated with direct ionization additional lines show up in the presence of a strong optical dressing field due to above-threshold ionization (ATI). These so called sidebands undergo strong variations of their intensity as a function of the relative polarization of the VUV and the optical field [1]. The variations showed different amplitudes for the 4 atomic or molecular systems which were investigated (Ar, N2, O2, H2O). This polarization and species dependence provides direct insight into the symmetry of the outgoing electron wave and therefore insight into the symmetry of the outer shell orbitals of the bound system.
M.Meyer et al, PRL 101, 193002 (2008)