Vibrational Relaxation in Gases and Molecular Lasers

Gordiet︠s︡, B. F.; Осипов, А. И.; Stupochenko, E. V.; Shelepin, L. A.

doi:10.1070/pu1973v015n06abeh005065

Cited by 162 publications

(127 citation statements)

References 3 publications

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“…At these conditions, a significant fraction of input power in the pulsed discharge is spent on electronic excitation, dissociation, and ionization of nitrogen, while nearly all input power in the dc discharge (up to 80-90% [15]) is stored in the vibrational energy mode of nitrogen, with little power going to translational/rotational modes, i.e., to heat. Because of a very long N 2 vibrational relaxation time at near room temperature, 1 atm s [18], this approach can create essentially vibrationally frozen nitrogen and airflows in the supersonic test section, with vibrational temperature greatly exceeding the translational/rotational mode temperature.…”

Section: Experimental a Mach 5 Wind Tunnelmentioning

confidence: 99%

Nitrogen Vibrational Population Measurements in the Plenum of a Hypersonic Wind Tunnel

et al. 2012

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Picosecond coherent anti-Stokes Raman scattering is used for measurement of nitrogen vibrational distribution function in the plenum of a highly nonequilibrium Mach 5 wind-tunnel incorporating a high-pressure pulsersustainer discharge. First-level vibrational temperatures of the order of 2000 K are achieved in the 300 torr non-selfsustained plasma discharge generated by a high E=n (300 Td) nanosecond-pulsed discharge, which provides ionization in combination with an orthogonal low E=n (10 Td) dc sustainer discharge, which efficiently loads the nitrogen vibrational mode. It is also shown that operation with the nanosecond-pulsed plasma alone results in significant vibrational energy loading, with T v N 2 of the order of 1100 K. Downstream injection of CO 2 , NO, and H 2 results in vibrational relaxation, demonstrating the ability to further tailor the vibrational energy content of the flow. N 2 -NO vibration-vibration and N 2 -H 2 vibration-translation rates inferred from these data agree well with previous literature results to within the uncertainty in rotational-translational temperature.

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Section: Experimental a Mach 5 Wind Tunnelmentioning

confidence: 99%

Nitrogen Vibrational Population Measurements in the Plenum of a Hypersonic Wind Tunnel

et al. 2012

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“…It is known from experiments Gordiets et al (1988) that in a vibrationally excited gas, near-resonant vibrational energy exchanges between molecules of the same chemical species proceed much faster than non-resonant transitions between different molecules, as well as transfers of vibrational energy to other modes and chemical reactions. Therefore the following relation between the characteristic relaxation times is fulfilled:…”

Section: Governing Equationsmentioning

confidence: 99%

Vibrational and Chemical Kinetics in Non-Equilibrium Gas Flows

Kustova¹,

Нагнибеда²

2012

Chemical Kinetics

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“…In the sixties, these results provided a laser revolution (Zeldovich, Raizer, 1966; Gordiets et al, 1973;Osipov, Uvarov, 1992). The establishment of a non-equilibrium molecular physics began due to the progress in laser technique and research in physics and chemistry that followed.…”

Section: Introduction Basic Equations and Starting Pointsmentioning

confidence: 99%

“…Equation (2) is valid over the temperatures where one can neglect anharmonic effects, i.e., below the characteristic temperatures which are fairly high for most molecules (Zeldovich, Raizer, 1966; Gordiets et al, 1973;Osipov, Uvarov, 1992). The mass, momentum and energy conservation equations governing the thermoviscous flow in a vibrationally relaxing gas read:…”

Section: Introduction Basic Equations and Starting Pointsmentioning

confidence: 99%

Nonlinear Influence of Sound on the Vibrational Energy of Molecules in a Relaxing Gas

Perelomova¹

2012

Archives of Acoustics

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Dynamics of a weakly nonlinear and weakly dispersive flow of a gas where molecular vibrational relaxation takes place is studied. Variations in the vibrational energy in the field of intense sound is considered. These variations are caused by a nonlinear transfer of the acoustic energy into energy of vibrational degrees of freedom in a relaxing gas. The final dynamic equation which describes this is instantaneous, it includes a quadratic nonlinear acoustic source reflecting the nonlinear character of interaction of high-frequency acoustic and non-acoustic motions in a gas. All types of sound, periodic or aperiodic, may serve as an acoustic source. Some conclusions about temporal behavior of the vibrational mode caused by periodic and aperiodic sounds are made.

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Vibrational Relaxation in Gases and Molecular Lasers

Cited by 162 publications

References 3 publications

Nitrogen Vibrational Population Measurements in the Plenum of a Hypersonic Wind Tunnel

Nitrogen Vibrational Population Measurements in the Plenum of a Hypersonic Wind Tunnel

Vibrational and Chemical Kinetics in Non-Equilibrium Gas Flows

Nonlinear Influence of Sound on the Vibrational Energy of Molecules in a Relaxing Gas

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