SPECTROSCOPY OF E1[-AO(-) AND DO-[-AO(-) TRANSITIONS IN CDHG EXCIMER

Pump-and-probe methods of laser spectroscopy were used to excite fluor escence from the E1 and D0(-) states of the CdHg excimer. The excitati on spectrum extended from about 420 to over 480 nm with some structure in the 435-470 nm region. Probe-laser irradiation at various waveleng ths in this spectral region gave rise to a fluorescence spectrum exten ding from 230 to 260 nm which overlaps the background excited by the p ump laser only. We assigned the excitation spectrum to arise from E1<- -A0(-) (quasibound<--bound) vibrational transitions and D0(-)<--A0(-) (free<--bound) transitions, and the fluorescence spectrum to arise fro m E1-->XO(+) or D0(-)-->E1-->X0(+) transitions according to the potent ial-energy (PE) diagram based on Hund's case-(c) coupling.