High-Resolution Laser Photoacoustic Spectroscopy of OCS in the 12 000-13 000 cm(-1) Region.
A spectrum of natural OCS has been recorded in the near-infrared region using the laser photoacoustic technique. The source is a titanium-sapphire laser pumped by an Ar(+) laser. The tunable 1.5 W beam was sent through the photoacoustic cell. This windowless longitudinal resonant cell was designed with two lambda/4 buffer volumes at both ends in order to reduce the noise and so to increase the sensitivity (alpha(min) approximately 10(-9) cm(-1)). The spectrum of OCS, at a pressure of 90 Torr, has been recorded in the regions 11 953-12 084, 12 829-12 890, and 12 998-13 001 cm(-1). In addition to the 00(0)6-00(0)0 band of (16)O(12)C(32)S recently identified by Ch. Hornberger, B. Boor, R. Stuber, W. Demtröder, S. Naïm, and A. Fayt, J. Mol. Spectrosc. 179, 237-245, 1996, new weaker bands have been observed: 04(0)5-00(0)0, 1 10(0)3-00(0)0, 10(0)6-00(0)0, 14(0)5-00(0)0, 02(0)6-00(0)0, and 01(1)6-01(1)0, and also the 00(0)6-00(0)0 band of (16)O(12)C(34)S. Effective state parameters are deduced from the band-by-band least-squares fits. The new data have also been introduced in the global analysis which takes into account the l-type resonance and the main anharmonic interactions and so allows a full understanding of the perturbations and the intensity transfers. Copyright 1999 Academic Press.
Centre d'Etudes et de Recherches Lasers et Applications, Université des Sciences et Technologies de Lille, Villeneuve d'Ascq Cedex, F 59 655, France
S
Tranchart
Hadj Bachir I
TR
Huet
A
Olafsson
J
Destombes
S
Naïm
A
Fayt