title: An upper limit to the acetylene abundance toward BN in the Orion molecular cloud.
abstract: We report a search for the acetylene (C2H2) nu 3 infrared vibration-rotation absorption near 3 micrometers toward the Becklin-Neugebauer source in the Orion molecular cloud.  The relative abundance of C2H2/CO in the quiescent gas (9 km s-1 component) is less than 3 x 10(-3) (5 sigma).
authors.affiliation: State University of New York at Stony Brook, USA.
authors.forename: R F
authors.initials: RF
authors.lastname: Knacke
authors.forename: Y H
authors.initials: YH
authors.lastname: Kim
authors.forename: W M
authors.initials: WM
authors.lastname: Irvine
mesh_terms: D000114:Acetylene / Q000032:analysis* / Q000737:chemistry; D055580:Astronomical Phenomena; D001256:Astronomy; D002248:Carbon Monoxide; D055598:Chemical Phenomena; D002621:Chemistry; D005118:Extraterrestrial Environment; D007259:Infrared Rays; D016081:Moon; D013057:Spectrum Analysis
chemical_list: D002248:Carbon Monoxide; D000114:Acetylene