Measurement of the formaldehyde ortho to para ratio in three molecular clouds

Details Measurement of the formaldehyde ortho to para ratio in three molecular clouds Measurement of the formaldehyde ortho to para ratio in three molecular clouds

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...137..211k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 137, no. 2, Aug. 1984, p. 211-222. Research supported by the Centre National d

Astronomy and Astrophysics

Astrophysics

52

Abundance, Formaldehyde, Interstellar Chemistry, Molecular Clouds, Orion Nebula, Ortho Para Conversion, Brightness Temperature, Gas Temperature, Molecular Spectra, Self Absorption, Thermalization (Energy Absorption), Thermodynamic Equilibrium

Scientific paper

Observations of ortho and para H2CO in two types of clouds, a warm cloud (Orion A) and two cold clouds (L183 and TMC1), are presented. The ortho to para ratio in Orion deduced from the H2(C-13)O data is about three, while that for TMC1 is about one and that for L183 is 1-2. The former value is in agreement with the value calculated from chemical models of ortho and para H2CO production. The values for the cold clouds are consistent with thermal equilibrium at a temperature slightly smaller than 10 K.

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