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Effect of a small C3O2 additive on the vibrational distribution function of CO molecules in a low-temperature plasma

  • Low-Temperature Plasma
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Abstract

The concentration of carbon suboxide (C3O2) in the plasmas of sealed-off discharges in mixtures of CO with noble gases is measured for the first time by mass-spectroscopic technique. It is shown that the production of C3O2 (and, possibly, more complex carbon oxides) in a gas-discharge plasma significantly boosts the vibrational relaxation of CO molecules and thus greatly affects their vibrational populations. Adding xenon to a He: CO mixture reduces the concentration of C3O2. The effect of pulsed UV radiation on the vibrational populations of CO molecules is studied experimentally. It is shown that UV irradiation of the gas mixture after long-term discharge operation increases vibrational populations in the plateau region up to the values observed at the beginning of the discharge. This effect is attributed to the decay of C3O2 molecules under the action of UV radiation.

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Authors and Affiliations

  1. Fock Research Institute of Physics, St. Petersburg State University, Ul’yanovskaya ul. 1, Petrodvorets, St. Petersburg, 198504, Russia

    G. M. Grigorian

  2. Troitsk Institute for Innovation and Fusion Research, Troitsk, Moscow oblast, 142090, Russia

    I. V. Kochetov

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  1. G. M. Grigorian
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  2. I. V. Kochetov
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Original Russian Text © G.M. Grigorian, I.V. Kochetov, 2006, published in Fizika Plazmy, 2006, Vol. 32, No. 3, pp. 273–280.

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Grigorian, G.M., Kochetov, I.V. Effect of a small C3O2 additive on the vibrational distribution function of CO molecules in a low-temperature plasma. Plasma Phys. Rep. 32, 246–253 (2006). https://doi.org/10.1134/S1063780X0603007X

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  • DOI: https://doi.org/10.1134/S1063780X0603007X

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