J. Phys. IV France 04 (1994) C4-751-C4-754
Pulsed photoacoustic study of collisional effects in IR multiphoton absorption measurementsJ. JOVANIC-KUREPA1, D.D. MARKUSEV1 and M. TERZIC2
1 Institute of Physics, P.O. Box 57, 11001 Belgrade, Serbia, Yugoslavia
2 University of Novi Sad, P.O. Box 224, 21001 Novi Sad, Serbia, Yugoslavia
The pulsed laser photoacoustic technique, simultaneously used with transmission spectroscopy, was applied for detailed study of IR multiphoton absorption processes in polyatomic molecules. Collisional effects were specially investigated in SF6 diluted with Ar as nonabsorbing species. The results regarding the enhanced absorption cross sections (σe) for SF6-Ar mixtures are obtained with precision of ±18 - ±29%. The differential absorption cross sections (σed), as well as the average number of absorbed photons <n> per SF6 molecule in 0,1 - 0,7 J/cm2 fluence range and 1 - 140 mbar Ar pressure range are also presented.
© EDP Sciences 1994