SIMBAD references

2001ApJ...551L.193G - Astrophys. J., 551, L193-L197 (2001/April-3)

Determination of the hyperfine structure of N2D+.

GERIN M., PEARSON J.C., ROUEFF E., FALGARONE E. and PHILLIPS T.G.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): ISM: Molecules - Molecular Data - Radio Lines: ISM

Simbad objects: 7

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2019.12.12-08:00:21

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