2002/12/13 by F. van der Tak, Floris F. S. van der Tak, D. C. Lis +15
Chemical Engineering · Pharmacology, Toxicology and Pharmaceutics · Physics and Astronomy · #Advanced Chemical Physics Studies #Ammonia Synthesis and Nitrogen Reduction #Astrophysics (astro-ph) #Chemical Reactions and Isotopes #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0212324
Four pages, one colour figure. to appear in: Chemistry as a diagnostic of star formation, eds. C.L. Curry & M. Fich (NRC Press)
arxiv created 2002/12/13 · openalex publication_date 2002/12/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Research on interstellar ND3 is reviewed and updated from the discovery papers. Results from observations of a dozen sources at centimeter and submillimeter wavelengths are presented. The two data sets are consistent, but do not constrain the excitation conditions in the ND3-emitting gas. The column density ratios of NH3:NH2D, NH2D:ND2H and ND2H:ND3, observed in similar sized beams, are ~10, and present a challenge for both the gas-phase and the grain-surface chemistry scenarios of deuterium fractionation. The role of shocks and of CO depletion in deuterium chemistry is discussed.