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Observation of interstellar ammonia iceAn absorption band probably due to solid ammonia on interstellar grains has been detected in the infrared spectrum at 2.97 microns of the Becklin-Neugebauer object and probably in NGC 2264-IR. An ammonia-water amorphous ice mixture can explain the structure of the new band and of the 3.07 microns interstellar absorption. Laboratory data suggest that a long wavelength wind extending to 3.5 microns in interstellar dust spectra may be absorption by NH3-H2O complexes in the ices. In the molecular cloud obscuring the BN object, about 20 times as much NH3 is frozen in grains as exists in the gas phase, suggesting the gas-grain interactions may be important in the ammonia chemistry of molecular clouds. Arguments are given that interstellar features at 6.0 and 6.8 microns are also ammonia-related absorptions.
Document ID
19820059155
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Knacke, R. F.
(New York, State University Stony Brook, NY; Max-Planck-Institut fuer Kernphysik, Heidelberg, Germany)
Mccorkle, S.
(New York, State University Stoney Brook, NY, United States)
Puetter, R. C.
(California, University San Diego, CA, United States)
Erickson, E. F.
(NASA Ames Research Center Moffett Field, CA, United States)
Kraetschmer, W.
(Max-Planck-Institut fuer Kernphysik Heidelberg, Germany)
Date Acquired
August 10, 2013
Publication Date
September 1, 1982
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
82A42690
Funding Number(s)
CONTRACT_GRANT: NAG2-56
Distribution Limits
Public
Copyright
Other

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