Abstract

Measurements of the energy distributions, Branching ratios, and angular distributions of electrons ejected from SrI 5p_3/2ns_1/2 and 5p_1/2ns_1/2 J=1 doubly excited states with n ranging from 10 to 20 in the autoionization to the SrII 5s, 4d, and 5p ion state have been made by the techniques of Isolated-Core-Excitation and Time-of-Flight Spectroscopy. The experiment consists of three Nd:YAG laser pumped tunable dye lasers which excite the Sr atoms in an atomic beam from the ground state to the 5p_3/2ns_1/2 or 5p_1/2ns_1/2 J=1 autoionizing states. The autoionizing electrons are analyzed in energy and angle by a time of flight analyzer, and the electrons and residual ions are collected by two microchannel plate detectors respectively and sent to the computer through the Boxcar Integrators. The measurements show that the doubly excited SrI 5p_3/2ns_1/2 and 5p_1/2ns_1/2 J=1 states autoionize predominantly to the excited SrII 4d ion states with a p or f electron. The asymmetry parameter varies continuously within the line profile of the 5p_3/2ns_1/2 J=1 states as the manifestation of the localized interaction between the SrI 5p_3/2ns_1/2 and 5p_1/2ns_1/2 J=1 autoionizing series. This variation is distinguished from that caused by the interference between the excitation to the bound part of the autoionizing state and underlying continua.

© 1986 Optical Society of America