1991/01/01 by Y. C. Minh, MINH, YC, William M. Irvine +3
Chemistry · Physics and Astronomy · #ABUNDANCES #Astro and Planetary Science #Astrophysics and Astronomy #Astrophysics and Star Formation Studies #CLOUDS #INTERSTELLAR MEDIUM #MOLECULES #Molecular Spectroscopy and Structure
paper · doi:10.7275/2383
openalex publication_date 1991/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Several H2CS ortho and para transitions have been observed toward interstellar molecular clouds, including cold, dark clouds and star-forming regions. We derive H2CS fractional abundances f(H2CS) approximately 1-2 10(-9) relative to molecular hydrogen towards TMC-1, Orion A, and NGC 7538, and approximately 5 10(-10) for L134N. The H2CS ortho-to-para ratios in TMC-1 are approximately 1.8 towards the cyanopolyyne peak and the ammonia peak, which may indicate the thermalization of H2CS on 10 K grains. We derive a ratio of approximately 3, the statistical value, for Orion (3N, 1E) and NGC 7538, while we find a value approximately 2 for Orion (KL).