Laboratory measurement of the N=1<-0 rotational transition of NH at 1THz.

Details Laboratory measurement of the N=1<-0 rotational transition of NH at 1THz. Laboratory measurement of the N=1<-0 rotational transition of NH at 1THz.

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...322l...1k&link_type=abstract

Astronomy and Astrophysics, v.322, p.L1-L4

Astronomy and Astrophysics

Astrophysics

16

Molecular Data, Methods: Laboratory, Techniques: Spectroscopic, Ism: Clouds, Ism: Molecules

Scientific paper

The N=1<-0 pure rotational transition of the NH radical (X^3SIGMA^-^), located at 1THz, was measured with the Cologne terahertz spectrometer using a frequency stabilized backward wave oscillator as radiation source. The NH radical was produced in a dc discharge of a flowing mixture of ammonia and helium. Transition frequencies of all three fine structure transitions with associated hyperfine components were precisely measured and analyzed to determine accurate molecular constants, including hyperfine coupling constants for both nuclei. As a result, the accuracy of the molecular constants has been improved by one to two orders of magnitude. The nuclear spin-rotation coupling constant for the nitrogen nucleus has been determined for the first time. The precise frequencies reported in this work are of importance to astronomical applications.

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