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

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Nikolić J., Rabasović M., Markushev D.

Acta Physica Polonica A

2007

vol. 112

issue 5

811-816

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 〈 nு_{total} on buffer-gas pressure (p_{buff}) 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.

Calculation of the Highly Excited SF_6 Vibrational State Distributions and Dissociation Yields in Different Gas Mixtures

100%

Nikolić J., Rabasović M., Markushev D.

Acta Physica Polonica A

2007

vol. 112

issue 5

817-822

Influence of the buffer gas on the multiphoton absorption and dissociation in different mixtures was investigated. Simple method based on the empirical and theoretical vibrational energy distribution is applied for high fluence regime. Collisional effects of buffer gas (Ar) are introduced to enhance the absorption and relaxation of irradiated molecules (SF_6 and C_2H_4). Functional dependences of mean number of absorbed photons per molecule (ீ nு_{total}) on the molecular excitation level are presented, enabling us to confirm or predict the level of excitation, number of molecules directly involved in the absorption process and dissociated during the laser pulse.

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2 Acta Physica Polonica A

2 2007

2 Markushev D.

2 Nikolić J.

2 Rabasović M.

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

Calculation of the Highly Excited SF_6 Vibrational State Distributions and Dissociation Yields in Different Gas Mixtures