H, C, N, and O Isotopic Substitution Studies of the 2165 Wavenumber (4.62 Micron) ``XCN'' Feature Produced by Ultraviolet Photolysis of Mixed Molecular Ices
Abstract
To better understand the chemical species that gives rise to the 2165 cm-1 (4.62 μm) ``XCN'' absorption feature seen toward embedded protostars such as W33A, we have performed laboratory studies using deuterium (2H) isotopic labeling. We report the observation of a small but significant deuterium isotope shift for the ``XCN'' peak which demonstrates that the atomic motion(s) causing the ``XCN'' band in the laboratory samples must involve hydrogen. We also report the results of 13C, 15N, and 18O labeling experiments that are consistent with previously reported values.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- October 2000
- DOI:
- 10.1086/317062
- Bibcode:
- 2000ApJ...542..894B
- Keywords:
-
- Infrared: ISM: Lines and Bands;
- ISM: Lines and Bands;
- ISM: Molecules;
- Methods: Laboratory