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Title: Influence of small oxygen additions on the small-signal-gain dynamics in the active medium of a pulsed electron-beam-controlled discharge CO laser

Abstract

The method for measuring the rate constants of the VV' exchange between CO and O{sub 2} molecules is developed. The method is based on a comparison of the measured and numerically calculated small-signal-gain (SSG) dynamics in the active medium of a pulsed electron-beam-controlled cryogenic CO laser. The SSG dynamics was measured in CO-He-O{sub 2} mixtures with the fixed CO:He = 1:4 ratio by varying the oxygen content from 0 to 4%. The SSG dynamics was measured by probing the active medium of the pulsed CO laser by a beam from a tunable cw CO laser. The mathematical model of the CO laser takes into account the influence of oxygen on energy exchange processes. The parameters of the analytic approximation for constants of the near-resonance VV' exchange CO(v)+O{sub 2}(u=0) {yields} CO(v-1)+O{sub 2}(u=1) are determined by the developed method for quantum vibrational numbers v = 18-24. In particular, the rate constant for v = 20 is (3.1{+-}0.5)x10{sup -12} cm{sup 3} s{sup -1} at the gas temperature of 150 K. The extrapolation of the obtained analytic expression for rate constants in gases at room temperature gives the reasonable agreement with the measurements performed earlier for v = 12 and 13. (active media. lasers)

Authors:
; ; ;  [1]; ; ;  [2]
  1. P. N. Lebedev Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)
  2. State Research Center of Russian Federation 'Troitsk Institute for Innovation and Fusion Research', Troitsk, Moscow Region (Russian Federation)
Publication Date:
OSTI Identifier:
21476068
Resource Type:
Journal Article
Journal Name:
Quantum Electronics (Woodbury, N.Y.)
Additional Journal Information:
Journal Volume: 38; Journal Issue: 9; Other Information: DOI: 10.1070/QE2008v038n09ABEH013812; Journal ID: ISSN 1063-7818
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; APPROXIMATIONS; CARBON MONOXIDE; ELECTRON BEAMS; ENERGY TRANSFER; EXTRAPOLATION; GAS LASERS; GASES; MATHEMATICAL MODELS; MOLECULES; OXYGEN; OXYGEN ADDITIONS; REACTION KINETICS; RESONANCE; SIGNALS; TEMPERATURE RANGE 0273-0400 K; BEAMS; CALCULATION METHODS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; ELEMENTS; FLUIDS; KINETICS; LASERS; LEPTON BEAMS; MATHEMATICAL SOLUTIONS; NONMETALS; NUMERICAL SOLUTION; OXIDES; OXYGEN COMPOUNDS; PARTICLE BEAMS; TEMPERATURE RANGE

Citation Formats

Ionin, A A, Klimachev, Yu M, Kozlov, A Yu, Kotkov, A A, Kurnosov, A K, Napartovich, A P, and Shnyrev, S L. Influence of small oxygen additions on the small-signal-gain dynamics in the active medium of a pulsed electron-beam-controlled discharge CO laser. United States: N. p., 2008. Web. doi:10.1070/QE2008V038N09ABEH013812.
Ionin, A A, Klimachev, Yu M, Kozlov, A Yu, Kotkov, A A, Kurnosov, A K, Napartovich, A P, & Shnyrev, S L. Influence of small oxygen additions on the small-signal-gain dynamics in the active medium of a pulsed electron-beam-controlled discharge CO laser. United States. https://doi.org/10.1070/QE2008V038N09ABEH013812
Ionin, A A, Klimachev, Yu M, Kozlov, A Yu, Kotkov, A A, Kurnosov, A K, Napartovich, A P, and Shnyrev, S L. 2008. "Influence of small oxygen additions on the small-signal-gain dynamics in the active medium of a pulsed electron-beam-controlled discharge CO laser". United States. https://doi.org/10.1070/QE2008V038N09ABEH013812.
@article{osti_21476068,
title = {Influence of small oxygen additions on the small-signal-gain dynamics in the active medium of a pulsed electron-beam-controlled discharge CO laser},
author = {Ionin, A A and Klimachev, Yu M and Kozlov, A Yu and Kotkov, A A and Kurnosov, A K and Napartovich, A P and Shnyrev, S L},
abstractNote = {The method for measuring the rate constants of the VV' exchange between CO and O{sub 2} molecules is developed. The method is based on a comparison of the measured and numerically calculated small-signal-gain (SSG) dynamics in the active medium of a pulsed electron-beam-controlled cryogenic CO laser. The SSG dynamics was measured in CO-He-O{sub 2} mixtures with the fixed CO:He = 1:4 ratio by varying the oxygen content from 0 to 4%. The SSG dynamics was measured by probing the active medium of the pulsed CO laser by a beam from a tunable cw CO laser. The mathematical model of the CO laser takes into account the influence of oxygen on energy exchange processes. The parameters of the analytic approximation for constants of the near-resonance VV' exchange CO(v)+O{sub 2}(u=0) {yields} CO(v-1)+O{sub 2}(u=1) are determined by the developed method for quantum vibrational numbers v = 18-24. In particular, the rate constant for v = 20 is (3.1{+-}0.5)x10{sup -12} cm{sup 3} s{sup -1} at the gas temperature of 150 K. The extrapolation of the obtained analytic expression for rate constants in gases at room temperature gives the reasonable agreement with the measurements performed earlier for v = 12 and 13. (active media. lasers)},
doi = {10.1070/QE2008V038N09ABEH013812},
url = {https://www.osti.gov/biblio/21476068}, journal = {Quantum Electronics (Woodbury, N.Y.)},
issn = {1063-7818},
number = 9,
volume = 38,
place = {United States},
year = {Tue Sep 30 00:00:00 EDT 2008},
month = {Tue Sep 30 00:00:00 EDT 2008}
}