title: The chemical composition of interstellar molecular clouds.
abstract: Relative abundances for molecules observed by radio astronomical techniques have been determined for several interstellar regions with differing physical properties.
authors.affiliation: Astronomy Program, University of Massachusetts, Amherst 01003, USA.
authors.forename: W M
authors.initials: WM
authors.lastname: Irvine
authors.forename: A
authors.initials: A
authors.lastname: Hjalmarson
mesh_terms: D001256:Astronomy / Q000379:methods*; D002248:Carbon Monoxide / Q000032:analysis; D019418:Evolution, Chemical; D005118:Extraterrestrial Environment; D005740:Gases / Q000032:analysis*; D006859:Hydrogen / Q000032:analysis; D006856:Hydrogen Cyanide / Q000032:analysis; D009570:Nitriles / Q000032:analysis; D013057:Spectrum Analysis
chemical_list: D005740:Gases; D009570:Nitriles; D006856:Hydrogen Cyanide; D002248:Carbon Monoxide; D006859:Hydrogen