Physics – Atomic Physics
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mfsku..45...47y&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
Ionization property of highly excited Rydberg states of rubidium 85 under a rotating electric field has been investigated experimentally and theoretically. In the experiment, manifold states whose principal quantum number 112 ≤ n ≤ 137 have been directly populated by a two-step laser excitation and ionized by a pulsed electric field. The pulsed electric field has been reversed through zero field and increased to ionize the Rydberg atoms. We have applied an additional static field perpendicular to the pulsed field to rotate the total electric field vector around zero field. Applying the perpendicular field, we have observed the increase of the fraction of the tunneling ionization process and the broadening of the width of its ionization peak in the ionization spectra. The n and slew rate dependence of the fraction of the tunneling ionization has also been measured. The fraction is almost flat with n ranging from 112 to 137 and decreases slightly with the increasing slew rate of the pulsed electric field. In the theoretical simulations, we have performed two calculations of (1) transition probability between states with different magnetic quantum number ml during the electric field rotation and (2) time evolution of the states with each ml on the Stark map under the ramped field after the field rotation. These two calculations have been combined to obtain the fraction of the tunneling ionization, which has been compared with the experimental results in the present study. The theoretical results are in good agreement with the experimental ones, which demonstrates the redistribution of ml and the position in the manifold by the field rotation. From the viewpoint of application, the increase of the tunneling process by the field rotation gives the improvement of the efficiency of selective field ionization. In the present work, we have found that the fraction of the tunneling ionization can be increased to over 0.9 by the field rotation.
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