Wide fluctuations in fluorescence lifetimes of individual rovibronic levels in SiH2 (Ã 1B1)

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Abstract
We have measured fluorescence lifetimes of individual rovibronic levels in SiH2 (à 1B1, 020). The lifetimes vary widely from one level to the next, ranging from ≲10 ns to >1 μs. Similar behavior is seen in the (000), (010), and (030) levels. This behavior is interpreted in terms of coupling of the à 1B1 rovibronic levels with background levels in the X̃ 1A1 (S0) and ã 3B1 (T1) states, and thence via predissociation to Si(3P)+H2. The irregular variation in the lifetimes reflects the quasirandom spacings of S0 and T1 levels in the vicinity of any particular à state level.