Determination of the Hyperfine Structure of N2D+

Details Determination of the Hyperfine Structure of N2D+ Determination of the Hyperfine Structure of N2D+

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...551l.193g&link_type=abstract

The Astrophysical Journal, Volume 551, Issue 2, pp. L193-L197.

Astronomy and Astrophysics

Astronomy

18

Ism: Molecules, Molecular Data, Radio Lines: Ism

Scientific paper

We present new high spectral resolution observations of the N2D+ J=2-->1 and J=3-->2 as well as N2H+ J=3-->2 lines toward dense molecular cores. The hyperfine structure of the N2H+ and N2D+ transitions is clearly resolved in these sources, in excellent agreement with quantum mechanical calculations. Optical depths are determined from the observed spectra, leading to D/H values on the order of 10%-30% for the N2D+/N2H+ system. There are a large number of hyperfine components, and in addition to providing satellites, they contribute to the broadening and asymmetric shapes of the N2H+ and N2D+ line profiles. It is therefore important to take into account the detailed hyperfine structure of the transitions when deducing astrophysical parameters from observed data.

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