H$_{2}$O Maser Pumping: The Effect of Quasi-Resonance Energy Transfer in Collisions between H$_2$ and H$_2$O Molecules

A. V. Nesterenok; D. A. Varshalovich

doi:10.1134/S1063773714070068

paper

H $_{2}$ O Maser Pumping: The Effect of Quasi-Resonance Energy Transfer in Collisions between H $_{2}$ and H $_{2}$ O Molecules

arXiv:1407.3135 · doi:10.1134/S1063773714070068

Abstract

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

arXiv admin note: text overlap with arXiv:1309.7547

References in corpus (1)

H_2^{16}O and H_2^{18}O Maser Emission from Gas-Dust Clouds

Cited by in corpus (1)

Collisional excitation of water by hydrogen atoms

H2​O Maser Pumping: The Effect of Quasi-Resonance Energy Transfer in Collisions between H2​ and H2​O Molecules

Abstract

References in corpus (1)

Cited by in corpus (1)

H $_{2}$ O Maser Pumping: The Effect of Quasi-Resonance Energy Transfer in Collisions between H $_{2}$ and H $_{2}$ O Molecules