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(O_u⁺) ← X ¹∑_g⁺ transition, but the underlying continuum also results from the ¹Π_1u ← X ¹∑_g⁺ and A ³Π_1u ← 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 ²P_3/2 + ²P_1/2 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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