Population anti-inversion in the 2(0) - 3(-1)E transition of CH3OH

Details Population anti-inversion in the 2(0) - 3(-1)E transition of CH3OH Population anti-inversion in the 2(0) - 3(-1)E transition of CH3OH

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.260..529p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 260, no. 3, p. 529-536.

Astronomy and Astrophysics

Astronomy

19

Electron Transitions, Interstellar Matter, Methyl Alcohol, Molecular Absorption, Molecular Clouds, Interstellar Masers, Molecular Collisions, Molecular Excitation, Molecular Rotation, Radiative Transfer

Scientific paper

To investigate the observed absorption of the 2(0) - 3(-1)E transition of CH3OH at 12.2 GHz against the 2.7-K microwave background, statistical equilibrium calculations involving radiative transitions, collisional transitions, and photon trapping have been carried out for the lowest 69 rotational levels of E-species CH3OH. The results show that population anti-inversion of the transition is a combined effect of spontaneous transitions and non-dominating collisional excitation. For molecular clouds not associated with continuum emission, stronger absorption at the transition is expected from warmer clouds. An E-species CH3OH abundance of 10 exp -8 - 10 exp -9 is derived. The model also suggests that the transition can occur as a maser emission in the presence of a bright continuum background with a temperature higher than the kinetic temperature of the cloud. The results are used to re-assess the CH3OH properties of the giant molecular cloud G 1.6-0.025.

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