Physics – Atomic Physics
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mfsku..43..163k&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
The Stark structure and time evolution of highly excited 85Rb Rydberg states in a pulsed electric field have been studied experimentally as well as theoretically. The Rydberg states in 85Rb with the principal quantum number n ranging from 110 to 140 have been excited with the two step laser excitation scheme and field ionization spectra under the pulsed electric field were observed with the ionized electron detection. From the systematic measurements it was found that the in general there exist two peaks in the field ionization spectrum: the lower peak is rather broad and the field value of the peak does not depend on the excitation position in the manifold. The value of the higher peak field, on the other hand, increases with increasing bluer states in the manifold when the pulsed electric field is increased in the same direction with the initially applied static field. However when the pulsed field is increased in the reversed direction to the static field, the peak field value decreases with increasing bluer state excitations, showing the opposite behavior to the case in the same field-driving direction. In order to reveal the origin of these two peak-field values in the ionization process, theoretical calculations of the Stark structure and ionization rates in an electric field have been performed with a computational method based on the Hamiltonian diagonalization. From these calculations it was found that the excitation position dependence of the higher peaks observed in the field ionization is in good agreement with the predictions from the tunneling process. On the other hand the lower peak behavior is roughly explained from the autoionization-like process together with the effect of the blackbody-induced radiative transitions to the neighboring states from the orignally excited states. In due course of the above investigations, time evolution of the multi-level Rydberg system in a pulsed electric field was also studied to confirm the usefulness and applicabilities of the present method of theoretical calculations. Specifically the transition probabilities in the first avoided crossing at which the 113p3/2 state crosses the bluest state in the 110 manifold was measured and compared with the theoretical predictions obtained from a newly developed formalism on the time evolution of multi-level Rydberg system. The experimental results are in good agreement with the predictions. The opposite behavior in the excitation-position dependence of the higher ionization peak-field between the same and the reversed driving directions of the pulsed electric field was also found to be well explained with the present theoretical treatment in the time evolution, thus showing that the present theoretical treatment is quite satisfactory even in such highly excited Rydberg atoms.
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