Physics – Atomic Physics
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mfsku..45....1k&link_type=abstract
Memoirs of the Faculty of Science, Kyoto University, Series of Physics, Astrophysics, Geophysics and Chemistry, (ISSN 0368-9689)
Physics
Atomic Physics
Atomic Physics
Scientific paper
Time evolution of the 113s1/2 state of 85Rb in a pulsed electric field was investigated at the region of the first avoided-crossing with its adjacent manifold. The state was initially prepared by laser excitations at a well isolated Stark position from the manifold, and driven into an electric field (Fr) over the first avoided crossing point with various slew-rates. The s1/2 state was then field-ionized with a following high slew-rate pulsed electric field; specifically in this field ionization process with high slew-rate regime, a constant transverse electric field was applied to enhance the tunneling field ionization process resulting from the angular momentum rotation due to the effect of a rotating electric field. Three paths through the Stark map were identified with sharp peaks in the ionization field-strength observed. One path corresponds to the autoionization-like process, while the other two paths are due to the tunneling processes with an adiabatic and a non-adiabatic transition, respectively. Transition rates to these ionization paths, measured as a function of the slew rate, were found to be strongly dependent on how deep the state is driven into the manifold-merged region at Fr before the fast ionization-pulse was subsequently applied. Quantum theoretical predictions, taking into account explicitly the occurrence of the multilevel avoided crossings, reproduce well the experimental transition rates to the paths leading to the tunneling field-ionization. The transitions leading to the autoionization-like process, however, show different behavior from those to the tunneling process, indicating an interference effect in the process.
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