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Article Dans Une Revue Journal of Physical Chemistry Letters Année : 2018

Collisional Excitation and Weak Maser Action of Interstellar Methanimine

François Lique
Anthony Remijan
  • Fonction : Auteur

Résumé

The inelastic cross sections and rate coefficients for the rotational excitation of methanimine (CH2NH) by cold H2 have been determined quantum mechanically based on a new highly correlated five-dimensional potential energy surface. This surface was fitted to more than 60 000 ab initio points with a root-mean-square error of ∼1–2 cm–1 in the region of the potential well whose depth is −374.0 cm–1. The rotationally inelastic rate coefficients have been combined with spectroscopic data to generate the nonequilibrium spectrum of CH2NH toward the interstellar molecular cloud Sgr B2(N). The transition 110 → 111 at 5.29 GHz is found to be inverted, and the predicted weak maser emission spectrum is in excellent agreement with new observations performed with the 100 m Green Bank Telescope.

Dates et versions

hal-03045135 , version 1 (07-12-2020)

Identifiants

Citer

Alexandre Faure, François Lique, Anthony Remijan. Collisional Excitation and Weak Maser Action of Interstellar Methanimine. Journal of Physical Chemistry Letters, 2018, 9 (12), pp.3199-3204. ⟨10.1021/acs.jpclett.8b01431⟩. ⟨hal-03045135⟩
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