Wide fluctuations in fluorescence lifetimes of individual rovibronic levels in SiH2(Atilde;thinsp;1B1)

摘要

We have measured fluorescence lifetimes of individual rovibronic levels in SiH2(Atilde;thinsp;1B1, 020). The lifetimes vary widely from one level to the next, ranging from lsim;10 ns to 1 mgr;s. Similar behavior is seen in the (000), (010), and (030) levels. This behavior is interpreted in terms of coupling of theAtilde;thinsp;1B1rovibronic levels with background levels in theXtilde;thinsp;1A1(S0) andatilde;thinsp;3B1(T1) states, and thence via predissociation to Si(3P)+H2. The irregular variation in the lifetimes reflects the quasirandom spacings ofS0andT1levels in the vicinity of any particularAtilde; state level.