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

Journal Article · Tue Sep 30 00:00:00 EDT 2008 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2008V038N09ABEH013812· OSTI ID:21476068

Ionin, A A; Klimachev, Yu M; Kozlov, A Yu; Kotkov, A A ^[1]; Kurnosov, A K; Napartovich, A P; Shnyrev, S L ^[2]

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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)

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)

• OSTI ID: 21476068
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Vol. 38, Issue 9; Other Information: DOI: 10.1070/QE2008v038n09ABEH013812; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

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