Time evolution of the pulsed HF chemical laser system. I. Kinetic modeling - rotational nonequilibrium

A. Ben-Shaul; S. Feliks; O. Kafri

doi:10.1016/0301-0104(79)85014-4

Time evolution of the pulsed HF chemical laser system. I. Kinetic modeling - rotational nonequilibrium

A. Ben-Shaul^*, S. Feliks, O. Kafri

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

A detailed model of a pulsed F + H₂ → HF + II laser is used to investigate the kinetic behaviour of the system and to provide input data for a thermodynamic analysis of its time evolution. The rate equations for all relevant vib-rotational level populations and photon densities are solved for various initial conditions without using the rotational equilibrium assumption. The results of the kinetic model are in good agreement with the experimental results of Berry in which high inert gas pressure was used to enhance rotational relaxation. The effects of specific kinetic processes on the time evolution of the molecular populations and the laser output are evaluated by varying the inert gas pressure and by "switching on and off" the influence of various kinetic factors. The laser efficiency ranges between ≈ 1 to 2 photons per molecule. The major rate process enhancing the efficiency is rotational relaxation. The reduction in laser efficiency due to vibrational relaxation is ≈ 20%.

Original language	English
Pages (from-to)	291-305
Number of pages	15
Journal	Chemical Physics
Volume	36
Issue number	3
DOIs	https://doi.org/10.1016/0301-0104(79)85014-4
State	Published - 1 Feb 1979

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abstract = "A detailed model of a pulsed F + H2 → HF + II laser is used to investigate the kinetic behaviour of the system and to provide input data for a thermodynamic analysis of its time evolution. The rate equations for all relevant vib-rotational level populations and photon densities are solved for various initial conditions without using the rotational equilibrium assumption. The results of the kinetic model are in good agreement with the experimental results of Berry in which high inert gas pressure was used to enhance rotational relaxation. The effects of specific kinetic processes on the time evolution of the molecular populations and the laser output are evaluated by varying the inert gas pressure and by {"}switching on and off{"} the influence of various kinetic factors. The laser efficiency ranges between ≈ 1 to 2 photons per molecule. The major rate process enhancing the efficiency is rotational relaxation. The reduction in laser efficiency due to vibrational relaxation is ≈ 20%.",

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AU - Ben-Shaul, A.

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N2 - A detailed model of a pulsed F + H2 → HF + II laser is used to investigate the kinetic behaviour of the system and to provide input data for a thermodynamic analysis of its time evolution. The rate equations for all relevant vib-rotational level populations and photon densities are solved for various initial conditions without using the rotational equilibrium assumption. The results of the kinetic model are in good agreement with the experimental results of Berry in which high inert gas pressure was used to enhance rotational relaxation. The effects of specific kinetic processes on the time evolution of the molecular populations and the laser output are evaluated by varying the inert gas pressure and by "switching on and off" the influence of various kinetic factors. The laser efficiency ranges between ≈ 1 to 2 photons per molecule. The major rate process enhancing the efficiency is rotational relaxation. The reduction in laser efficiency due to vibrational relaxation is ≈ 20%.

AB - A detailed model of a pulsed F + H2 → HF + II laser is used to investigate the kinetic behaviour of the system and to provide input data for a thermodynamic analysis of its time evolution. The rate equations for all relevant vib-rotational level populations and photon densities are solved for various initial conditions without using the rotational equilibrium assumption. The results of the kinetic model are in good agreement with the experimental results of Berry in which high inert gas pressure was used to enhance rotational relaxation. The effects of specific kinetic processes on the time evolution of the molecular populations and the laser output are evaluated by varying the inert gas pressure and by "switching on and off" the influence of various kinetic factors. The laser efficiency ranges between ≈ 1 to 2 photons per molecule. The major rate process enhancing the efficiency is rotational relaxation. The reduction in laser efficiency due to vibrational relaxation is ≈ 20%.

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Time evolution of the pulsed HF chemical laser system. I. Kinetic modeling - rotational nonequilibrium

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