Multiply-deuterated species in prestellar cores

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.