J. Phys. IV France
Volume 125, June 2005
Page(s) 23 - 25

J. Phys. IV France 125 (2005) 23-25

DOI: 10.1051/jp4:2005125006

Rotational influence on multiphoton absorption efficiency in SF6-N2 mixtures

D.D. Markushev1, M. Rabasovic1, M. Terzic2 and J. Jovanovic-Kurepa1

1  Institute of Physics, Pregrevica 118, 11080 Beograd-Zemun, Serbia & Montenegro
2  Department of Physics, University of Novi Sad, 21000 Novi Sad, Serbia Montenegro

The results of pulsed IR photoacoustic spectroscopy measurements of multiphoton absorption and rotational relaxation processes in SF6-N2 mixtures are presented. Total average number ( $<n>_{\rm total}$) of absorbed photons per one absorbing molecule (SF6) during the laser pulse was compared with average number of absorbed photons ( $<n>_{\rm v}$) really stored in SF6 vibrational modes, using generalized coupled two-level model. Obtained results can be used to confirm or predict the excitation level ( $<n>_{\rm v}$) of absorbing molecule during the laser pulse, as a function of added buffer-gases. This approach could allow one to control laser field - molecule interaction in different gas mixtures, understand the efficiency of collisional effects (especially rotational relaxation) and their positive and negative influence on absorption characteristics of irradiated polyatomic molecule.

© EDP Sciences 2005