Abstract
Vibronically resolved laser photoacoustic spectra of I2 vapor have been recorded at room temperature in the presence and absence of atmospheric air in the 490–680 nm (20402–14700 cm−1) region for what is, to our knowledge, the first time. The vibrational bands belong to the B 3Π(Ou+) ← X 1∑g+ transition, but the underlying continuum also results from the 1Π1u ← X 1∑g+ and A 3Π1u ← X 1a∑g+ transitions. The mechanisms of photoacoustic signal generation are discussed by analyzing the photoacoustic intensity in light of Franck–Condon factors for the B ← X transition. Energy transfer to O2 caused by the photodissociation of I2 into 2P3/2 + 2P1/2 I atoms is observed in the presence of atmospheric air, and the predissociation of the B state has been observed for its vibrational levels v′ ~ 23–27.
© 1992 Optical Society of America
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