Limitations of the Generalized Coupled Two-Level Model during the Multiphoton Absorption in Different Gas Mixtures

J.D. Nikolić a, M.D. Rabasović b and D.D. Markushev b a Institute of Nuclear Sciences “Vinca”, P.O. Box 522, 11001 Beograd, Serbia b Institute of Physics, Pregrevica 118, 11080 Beograd - Zemun, Serbia

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Received: 3 09 2007;

Generalized coupled two-level model is applied in different gas mixtures and investigated for high fluence regime. Functional dependences of mean number of absorbed photons per molecule 〈n〉total on buffer-gas pressure (pbuff) are presented, used to confirm or predict some possible physical and chemical processes, like enhanced absorption and/or dissociation. Limitations of proposed models are analyzed depending on both gas pressure and laser fluence. Results are compared with other previously obtained by the same experimental technique, but for different absorbing molecule.

DOI: 10.12693/APhysPolA.112.811 PACS numbers: 39.30.+w, 82.80.Kq, 07.57.Ty