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Applied Optics

Applied Optics


  • Vol. 31, Iss. 24 — Aug. 20, 1992
  • pp: 4987–4994

Photoacoustic spectrum of iodine in the 490–680-nm (20402–14700-cm−1) region

K. Narayanan and S. N. Thakur  »View Author Affiliations

Applied Optics, Vol. 31, Issue 24, pp. 4987-4994 (1992)

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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 B3Π(Ou+) ← X1g+ transition, but the underlying continuum also results from the 1Π1uX1g+ and A3Π1uX1a∑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

Original Manuscript: May 17, 1991
Published: August 20, 1992

K. Narayanan and S. N. Thakur, "Photoacoustic spectrum of iodine in the 490–680-nm (20402–14700-cm−1) region," Appl. Opt. 31, 4987-4994 (1992)

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