J. Phys. IV France 125 (2005) 23-25
Rotational influence on multiphoton absorption efficiency in SF6-N2 mixturesD.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 ( ) of absorbed photons per one absorbing molecule (SF6) during the laser pulse was compared with average number of absorbed photons ( ) really stored in SF6 vibrational modes, using generalized coupled two-level model. Obtained results can be used to confirm or predict the excitation level ( ) 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