High Resolution Spectroscopy of HCN Isotopomers: H13CN, HC15N, and H13C15N in the Ground and First Excited Bending Vibrational State

Details High Resolution Spectroscopy of HCN Isotopomers: H13CN, HC15N, and H13C15N in the Ground and First Excited Bending Vibrational State High Resolution Spectroscopy of HCN Isotopomers: H13CN, HC15N, and H13C15N in the Ground and First Excited Bending Vibrational State

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004znata..59..861f&link_type=abstract

Z. Naturforsch. 59a, 861-872

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Applications

6

Molecular Spectroscopy, Sub-Doppler Spectroscopy, High Resolution Spectroscopy, Hcn, Microwave Spectroscopy, Thz Spectroscopy, Hyperfine Structure, Direct L-Type Transition

Scientific paper

The eleven energetically lowest pure rotational transitions, J ?J ?1 (J =1, 2,...,11),of H13CN, H13C15N, and HC15N in the ground and first excited bending state were measured. By operating the Cologne Tetrahertz Wave Spectrometer up to 1 THz in the sub-Doppler mode, a transition frequency accuracy of a few kHz is achieved. These measurements were carried out at frequencies between 80 - 950 GHz. In addition, some transitions of the three isotopomers with rotational quantum numbers J = 20, 21, 22, 23 have been measured in Doppler-limited resolution near 2 THz, using the frequency stabilized Cologne Sideband Spectrometer for Terahertz Applications (COSSTA). Furthermore, direct l-type transitions of H 13CN in the first excited bending state with J up to 35 have been measured. These new data are of particular importance, since we discovered highly excited circumstellar H12CN recently. A global fit of the newly enlarged data set together with existing carefully screened ro-vibrational data yields molecular constants which are highly reliable and of great importance both for astrophysical observations and laboratory applications.

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