Physics – Atomic Physics
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mfsku..43....1t&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: Electric Fields
Scientific paper
We have investigated the properties of highly excited Rydberg states to establish a way to detect highly excited states selectively with pulsed field ionization method and to see possible coherent effects in highly excited Rydberg states with n>90 in pulsed electric field. The experiment on the field ionization process of the Rydberg states with the principal quantum number n = 98 - 150 in 85Rb has been carried out. For the first time, it has been observed that the electric field necessary to ionize the Rydberg states takes discrete values successively depending on the slew rate. Specifically the slew-rate dependence of the ionization field has varied with the quantum defect value of the states, i.e., with the energy position of the states relative to the adjacent manifold. This transitional behavior in the field ionization shows regular dependence on the principal quantum number n, thus indicating that this behavior is quite general and applicable to a wide range of higher-lying Rydberg states. From these characteristic behaviors, it is stongly suggested that the coherence in the time evolution under the pulsed electric field plays decisive role in field ionization. By selecting the shape of the pulse of the applied electric field properly, it is therefore possible to stringently select a low-l state from the close-lying states by field ionization. The differences in the field ionization values have been found to be large enough, for example, the field ionization value for 111s state has been as three times as that for the 111p state. The transitional behavior observed here brings us a new powerful method to selectively field-ionize the low l states from the many close-lying states, thus opening a new way to apply the highly excited Rydberg states to fundamental physics research.
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