SUB-DOPPLER MEASUREMENTS ON THE ROTATIONAL TRANSITIONS OF CARBON MONOXIDE
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Date
1997
Journal Title
Journal ISSN
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Publisher
Ohio State University
Abstract
The frequencies of the first six rotational transitions of the CO molecule have been measured to an accuracy of $\pm 500 Hz$ in the frequency region up to 700 GHz. This high level of accuracy was achieved with the Cologne terahertz spectrometer operated in the sub-Doppler mode (1). To carry out precise CO Lamb-dip measurements, Least squares fits of the new CO, and 0.26 kHz, respectively. The experimental setup and the results of a fit to the Lamb-dip data combined with the frequencies up to 4.3 THz $(J = 38 \leftarrow 37)$ given by Evenson (3) will be presented. The analysis yielded a revised set of rotational constants for CO in its vibrational ground state, which is in good agreement with the previous values given by Varberg and Evenson(4).
Description
(1)G.Winnewisser, S.P.Belov, Th. Klaus, and \v{S} Urban, Z. Naturforsch. 51a, 200-206(1996). (2)S.P.Belov, F. Lewen, Th. Klaus, and G. Winnewisser, J.Mol. Spectrosc. 174, 606-612(1995). (3)K.M. Evenson, Private communication, 52 Okazaki Conference, Okazaki, Japan, March 1995. (4)T.D. Varberg and K.M. Evenson, {Astrophys. J.} 385,763-765(1992).
Author Institution: I. Physikalishes Institut, Universit\""at zu K\""oln
Author Institution: I. Physikalishes Institut, Universit\""at zu K\""oln