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H2O maser pumping: The effect of quasi-resonance energy transfer in collisions between H2 and H2O molecules

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Abstract

The effect of quasi-resonance energy transfer in collisions between H2 and H2O molecules in H2O maser sources is investigated. New data on the state-to-state rate coefficients for collisional transitions for H2O and H2 molecules are used in the calculations. The results of ortho-H2O level population inversion calculations for the 22.2-, 380-, 439-, and 621-GHz transitions are presented. The ortho-H2O level population inversion is shown to depend significantly on the population distribution of the para-H2 J = 0 and 2 rotational levels. The possibility of quasi-resonance energy transfer in collisions between H2 molecules at highly excited rotational-vibrational levels and H2O molecules is considered. The quasi-resonance energy transfer effect can play a significant role in pumping H2O masers in the central regions of active galactic nuclei and in star-forming regions.

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Authors and Affiliations

  1. Ioffe Physical-Technical Institute, ul. Politekhnicheskaya 26, St. Petersburg, 194021, Russia

    A. V. Nesterenok & D. A. Varshalovich

  2. St. Petersburg State Polytechnical University, ul. Politekhnicheskaya 29, St. Petersburg, 195251, Russia

    D. A. Varshalovich

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  1. A. V. Nesterenok
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  2. D. A. Varshalovich
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Correspondence to A. V. Nesterenok.

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Original Russian Text © A.V. Nesterenok, D.A. Varshalovich, 2014, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2014, Vol. 40, No. 7, pp. 473–483.

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Nesterenok, A.V., Varshalovich, D.A. H2O maser pumping: The effect of quasi-resonance energy transfer in collisions between H2 and H2O molecules. Astron. Lett. 40, 425–434 (2014). https://doi.org/10.1134/S1063773714070068

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