DEPLETION OF HARMONIC OSCILLATOR STATES BY PERIODIC KICKS


N.~Sato$^{A}$, S.~Watanabe$^{A}$, M.~Matsuzawa$^{A}$, S.~Yoshida$^{B}$, 
C.~O.~Reinhold$^{B,C}$, J.~Burgd\"orfer$^{B,C,D}$


$^{{A}}$Department of Applied Physics and Chemistry, 
U.~of Electro-Communications,
1-5-1 Chofugaoka, Chofu-shi, Tokyo 182-8585, Japan
$^{{B}}$Department of Physics, University of Tennessee, Knoxville, U.S.A.
$^{{C}}$Physics Division, Oak Ridge National Laboratory, Oak Ridge, U.S.A.
$^{{D}}$Institute for Theoretical Physics, Vienna University of Technology, 
Austria


Ionization of high-lying Rydberg states of an atom by periodic
impulsive kicks differs from that of low-lying states.
The reason appears to be due to the nearly constant energy spacing
of Rydberg states. Exploiting a simple harmonic oscillator as a model, 
we account for the formation of depletion dips and metastable features.