A new search for and discovery of deuterated ammonia in three molecular clouds

Details A new search for and discovery of deuterated ammonia in three molecular clouds A new search for and discovery of deuterated ammonia in three molecular clouds

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...142l...1o&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 142, no. 1, Jan. 1985, p. L1-L4. Sponsorship: Deutsche Forschungsgemeinschaft.

Astronomy and Astrophysics

Astrophysics

18

Ammonium Compounds, Astronomical Spectroscopy, Cosmochemistry, Interstellar Gas, Molecular Clouds, Abundance, Deuterium Compounds, High Resolution, Hyperfine Structure

Scientific paper

An interstellar search for the two rotation-inversion components of the 111 - 101 transition of NH2D was performed towards four selected molecular clouds DR21(OH), S140, L183 and TMC1. Whereas the 85.9 GHz transition was detected in DR21(OH), S140 and L183, the 110 GHz component is considerably weaker and only marginally detected in DR21(OH). High resolution observations of the 85.9 GHz transition allow unambiguous identification of NH2D, and determination of optical depths and thus column densities by fitting LTE-profiles to the resolved hyperfine spectra. The observed intensity difference between the two rotation-inversion transitions in favour of the 85.9 GHz line is in agreement with the expected nuclear spin statistical weights of the levels involved, whereas strong chemical fractionation effects could cause the negative result in TMC1.

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