Abstract
The autoionization distribution of the double Rydberg (DR) states N'L' nl(N' <n;L',l<4) in calcium has been investigated by using five-laser resonance excitation and sequential ionization with a pulsed and a strong constant electric field. We have found that the DR states autoionize with the ejected electron having its kinetic energy apparently related to that of the electron in the Ca+ Rydberg orbit N'L'. We have discussed semiclassically the dynamics in the DR state and described two types of autoionizing processes, i.e., ''penetration autoionization'' and ''polarization autoionization'' in DR states. The former is responsible for our experimental results.
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