Journal
ASTRONOMY & ASTROPHYSICS
Volume 427, Issue 3, Pages 887-U37Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:20041464
Keywords
stars : formation; astrochemistry; ISM : clouds
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We have studied the ortho, para, and, in the case of D-3(+), meta forms of the multiply-deuterated isotopes of H-3(+), under physical conditions believed to be appropriate to pre-protostellar cores. As deuterons have integral nuclear spin, I=1, Bose-Einstein statistical laws apply. Having extended the network of chemical reactions used in our previous study (Walmsley et al. 2004), we have calculated the population densities of ortho- and para-D2H+ and of ortho- and meta-D-3(+). In the former case, comparison is made with the recent observations of para-D2H+ in the prestellar core 16293E (Vastel et al. 2004). Using radiative transition probabilities computed by Ramanlal & Tennyson (2004), we have predicted the intensities of the near infrared vibrational transitions of the deuterated isotopes of H-3(+). Many of these transitions can be observed, in absorption, only from above the Earth's atmosphere, but some might be detectable through atmospheric windows.
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