Measurement Of The Methyl Cyanide E/a Ratio In Tmc-1

1993/01/01 by Y. C. Minh, William M. Irvine, MINH, YC +9
Chemistry · Earth and Planetary Sciences · Physics and Astronomy · #ABUNDANCES #Advanced Chemical Physics Studies #Astrophysics and Astronomy #Atmospheric Ozone and Climate #CLOUDS #INTERSTELLAR MEDIUM #MOLECULES #Spectroscopy and Laser Applications

paper · doi:10.7275/2374

openalex publication_date 1993/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

Abstract

We have observed the methyl cyanide (CH3CN) J = 2-1 K=0 and 1 transitions toward the cyanopolyyne peak of TMC-1 and have derived an E/A (ortho/para) abundance ratio NE/NA approximately 0.75 +/- 0.10. The total methyl cyanide column density is Ntotal = 5 10(12) cm-2 toward TMC-1, in agreement with earlier results from the J=1-0 lines.

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