Frankfurt 2006 – wissenschaftliches Programm
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MO: Molekülphysik
MO 28: Poster: Quantum Control
MO 28.3: Poster
Dienstag, 14. März 2006, 16:30–18:30, Labsaal
Post-Tunneling Ionization of Atoms and Molecules in a Mid-IR Laser Field: Dynamics in the Quasistatic Regime — •Katharine Moore1,2, Ryan Compton2, Dmitri Romanov3, and Robert Levis2 — 1Physikalisches Institut, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Center for Advanced Photonics Research, Department of Chemistry, Temple University, Philadelphia, PA 19123 USA — 3Center for Advanced Photonics Research, Department of Physics, Temple University, Philadelphia, PA 19123 USA
Ionization yields are reported for the noble gas Xe and the molecules O2, benzene, and n-propyl benzene at laser intensities in the range of 1013-1015 W cm−2 for wavelengths spanning from 800nm to 1600nm. There is an increasing ionization probability in the strong field regime as the excitation wavelength increases from 800nm to 1600 nm at fixed field intensity. The measured thresholds for the ionization event scale approximately as λ−2. These observations are counter-intuitive from either the multiphoton or tunneling perspective. A simple quantitative model is developed that extends through-the-barrier tunneling with single photon ionization from a Rydberg intermediate state and captures the wavelength dependence.