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Issue 5, 2003
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The structure and electric dipole moment of camphor determined by rotational spectroscopy

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Abstract

The rotational spectrum of camphor was investigated for the first time. Accurate spectroscopic constants for the parent isotopomer were determined from measurements in supersonic expansion at 6.7–18.5 GHz, and on a room-temperature sample at 173–222 GHz. All three types of allowed dipole moment transitions, μa, μb, μc, were observed. The supersonic expansion spectrum allowed measurement, in natural abundance, of all ten singly substituted 13C isotopomers, as well as of the 18O isotopomer. The rotational constants were used to determine the rs, r0, and the r(1)m gas-phase geometries of the camphor molecule. The electric dipole moment of camphor was determined from Stark effect measurements, and is |μa| = 2.9934(23) D, |μb| = 0.7298(6) D, |μc| = 0.0804(7) D, μtot = 3.0821(22) D. The experimental results are compared with predictions from ab initio calculations and with the geometry of solid camphor.

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Submitted
05 Dec 2002
Accepted
17 Jan 2003
First published
29 Jan 2003

Phys. Chem. Chem. Phys., 2003,5, 820-826
Article type
Paper

The structure and electric dipole moment of camphor determined by rotational spectroscopy

Z. Kisiel, O. Desyatnyk, E. Białkowska-Jaworska and L. Pszczółkowski, Phys. Chem. Chem. Phys., 2003, 5, 820
DOI: 10.1039/B212029A

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