title: Detection of the 2165 inverse centimeter (4.619 micron) XCN band in the spectrum of L1551 IRS 5.
abstract: We report the detection of a broad absorption band at 2165 cm-1 (4.619 microns) in the spectrum of L1551 IRS 5.  New laboratory results over the 2200-2100 cm-1 wavenumber interval (4.55-4.76 microns), performed with realistic interstellar ice analogs, suggest that this feature is due to a CN-containing compound.  We will refer to this compound as XCN.  We also confirm the presence of frozen CO (both in nonpolar and polar matrices) through absorption bands at 2140 cm-1 (4.67 microns) and 2135 cm-1 (4.68 microns).  The relative abundance of solid-state CO to frozen H2O is approximately 0.13 while the abundance of XCN seems comparable to that of frozen CO.
authors.affiliation: Department of Physics and Astronomy, University of Notre Dame, IN, 46556, USA.
authors.forename: S C
authors.initials: SC
authors.lastname: Tegler
authors.forename: D A
authors.initials: DA
authors.lastname: Weintraub
authors.forename: L J
authors.initials: LJ
authors.lastname: Allamandola
authors.forename: S A
authors.initials: SA
authors.lastname: Sandford
authors.forename: T W
authors.initials: TW
authors.lastname: Rettig
authors.forename: H
authors.initials: H
authors.lastname: Campins
mesh_terms: D055580:Astronomical Phenomena; D001256:Astronomy; D002248:Carbon Monoxide / Q000737:chemistry; D005118:Extraterrestrial Environment; D007053:Ice / Q000032:analysis*; D019110:Meteoroids; D008956:Models, Chemical; D009570:Nitriles / Q000737:chemistry*; D013055:Spectrophotometry, Infrared
chemical_list: D007053:Ice; D009570:Nitriles; D002248:Carbon Monoxide