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Transient processes in vibrationally excited diatomic gas with downwards flux of quanta

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The kinetic cooling and formation of absolute inversion are studied numerically for the cases of a jump in the translational temperature of a vibrationally excited gas and instantaneous admixing of unexcited gas.

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T1 :

vibrational temperature of the first vibrational level of the CO molecule

E1 :

energy of this level


translational temperature of the gas


anharmonicity of the CO molecule


Mach number

P2, ρ2, P1, ρ1 :

pressure and density of the gas behind the front of the shock wave and in front of the shock wave

γ :

adiabatic index


vibrational energy stored in the CO molecules and the total energy effects of the VV-exchange and VT-re-laxation processes [J/cm3]

WVV and WVT :

total rates at which energy is released in VV exchange and VT relaxation processes [W/cm3]

Literature cited

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    B. F. Gordiets, A. I. Osipov, and L. A. Shelepin, Kinetic Processes in Lasers and Molecular Lasers [in Russian], Moscow (1980).

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    S. A. Zhdanok, A. P. Napartovich, and A. N. Starostin, Zh. Éksp. Teor. Fiz.,76, No. 1, 130–139 (1979).

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    A. V. Dem'yanov et al., Zh. Prikl. Mekh. Tekh. Fiz., No. 3, 5–10 (1981).

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    S. A. Losev and V. N. Makarov, Kvantovaya Élektron.,12, No. 8, 1628–1631 (1985).

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    A. A. Ionin et al., “Investigation of the lasing characteristics of an electroionization CO laser based on nitrogen-containing mixtures,” Preprint No. 232, Quantum Radiophysics, Physics Institute of the Academy of Sciences of the USSR, Moscow (1982).

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    L. D. Landau and E. M. Lifshits, Hydrodynamics [in Russian], Moscow (1986).

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Additional information

Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 55, No. 4, pp. 624–629, October, 1988.

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Kochetov, I.V., Kurnosov, A.K. & Napartovich, A.P. Transient processes in vibrationally excited diatomic gas with downwards flux of quanta. Journal of Engineering Physics 55, 1150–1153 (1988). https://doi.org/10.1007/BF01155225

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  • Statistical Physic
  • Transient Process
  • Translational Temperature
  • Downward Flux
  • Kinetic Cool