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Radiative lifetime of the HCO B̃2A′ state

✍ Scribed by Ying Jen Shiu; I-Chia Chen

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
395 KB
Volume
222
Category
Article
ISSN
0009-2614

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✦ Synopsis

The fragment HCO, produced from acetaldehyde by photolysis at 300 nm, was detected by laser-induced fluorescence of B 'A'g 'A' transitions. The fluorescence lifetimes of the HCO B state decrease rapidly as the photolysis energy increases, indicating strong predissociation of the B state. The radiative lifetimes of B are in the range 70-90 ns for (0, 0,O) K'=O states and 42-50 ns for K'= 1 states. For all measured vibrational levels, the K'= 1 states have smaller average lifetimes than the K'=O states. Correction over individual lifetimes is necessary to obtain the state population if the fi state is excited. The state B (0, 1,O) has a shorter average lifetime than the states ( 1, 0,O) and (0, 0,2), despite having a lower energy.

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