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BY-NC-ND 3.0 license Open Access Published by De Gruyter June 2, 2014

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

U. Fuchs, S. Brünken, G.W. Fuchs, S. Thorwirth, V. Ahrens, F. Lewen, Š. Urban, T. Giesen and G. Winnewisser

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 H13CN 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

Received: 2004-8-20
Published Online: 2014-6-2
Published in Print: 2004-11-1

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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