Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...317l..43s&link_type=abstract
Astronomy and Astrophysics, v.317, p.L43-L46
Astronomy and Astrophysics
Astrophysics
68
Ism: Clouds, Ism: Dust, Extinction, Ism: Molecules, Stars: Pre-Main-Sequence
Scientific paper
The well-known "XCN" feature near 2167cm^-1^ observed towards various low- and high-mass embedded protostars can be well matched with a feature produced by photolysis of astrophysical ice analogs containing CO and NH_3_. An assignment of this laboratory XCN band to OCN^-^ was earlier proposed based on the correspondence in position and in the ^13^C and ^15^N isotopic shifts. We report here a further experimental study of this identification. First, the isotope shift of the XCN band obtained by irradiating ^18^O labelled ice samples equals 8.7+/-0.6cm^-1^, in good agreement with OCN^-^. Second, highly sensitive spectroscopy reveals three additional weak features which can be assigned to the OCN^-^ ion. Together with the earlier work, these results leave little doubt to the correctness of the identification of the laboratory XCN feature with OCN^-^.
Greenberg Mayo J.
Schutte Willem A.
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