Numéro
J. Phys. IV France
Volume 01, Numéro C7, Décembre 1991
2nd International Conference
Laser M2P
Page(s) C7-471 - C7-476
DOI http://dx.doi.org/10.1051/jp4:19917125
2nd International Conference
Laser M2P

J. Phys. IV France 01 (1991) C7-471-C7-476

DOI: 10.1051/jp4:19917125

INTRACAVITY LASER ABSORPTION SPECTROSCOPY OF NO2 AND CH4 COOLED IN A SLIT JET SUPERSONIC EXPANSION

A. CAMPARGUE1, M. CHENEVIER1, A. DELON2, R. JOST2 and F. STOECKEL1

1  Laboratoire de Spectrométrie Physique, Université Joseph Fourier/Grenoble I, BP. 87, F-38402 St-Martin-d'Hères cedex, France
2  Service National des Champs Intenses, C.N.R.S., BP. 166X, F-38042 Grenoble cedex, France


Abstract
The intracavity Laser Absorption Spectroscopy (ICLAS) has been use to observe weak absorption of NO2 and CH4 cooled in a supersonic jet through a slit. By this method, the thermally congested spectrum of the molecules is drastically simplified and analysis becomes possible. On NO2 we report preliminary results in the 13 470 - 14 440 cm-1 energy range where 20 vibronic bands have been observed. On CH4 the VCH = 5 overtone centered at 13 750 cm-1, which is unresolved at room temperature, displays only few lines not yet analysed.



© EDP Sciences 1991