Radio-astronomical Spectroscopy of the Hyperfine Structure of N 2H +

Details Radio-astronomical Spectroscopy of the Hyperfine Structure of N 2H + Radio-astronomical Spectroscopy of the Hyperfine Structure of N 2H +

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...455l..77c&link_type=abstract

Astrophysical Journal Letters v.455, p.L77

Astronomy and Astrophysics

Astronomy

106

Ism: Molecules, Molecular Data

Scientific paper

We present high spectral resolution and high-sensitivity observations of the J = 1 --> 0 transition of N2H+ at 93 GHz toward the quiescent low-mass cloud core L1512 in Taurus. The relative frequencies of the seven hyperfine components of this transition have been determined with precision ~1 kHz, and the absolute frequencies with precision ~7 kHz. The hyperfine coupling constants have been determined with precision an order of magnitude higher than previously in the laboratory. Relative intensities of the hyperfine components of N2H+ in L1512 as well as in a sample of ~60 low-mass cloud cores are not consistent with a single excitation temperature model fit, indicating the presence of excitation anomalies.

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