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 1g+ transition, but the underlying continuum also results from the 1Π1uX 1g+ and A 3Π1uX 1a∑g+ transitions. The mechanisms of photoacoustic signal generation are discussed by analyzing the photoacoustic intensity in light of Franck–Condon factors for the BX 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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