HYPERFINE STRUCTURE AND STARK EFFECT OF DBr
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Date
1971
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Publisher
Ohio State University
Abstract
The hyperfine structure and the Stark effect of the J = O $\rightarrow$ 1 rotational transition of the molecules $D^{79}Br$ and 254 GHz have been investigated with the high resolution submillimeter wave beam-spectrometer of this $laboratory^{1,2}$. The absorption cell of the spectrometer is a parallel-plate Stark cell. For maximum sensitivity a low frequency (1 kHz) square-wave Stark modulation and synchronous detection is used. The interaction-free frequency $v_{o}$ of the transition and the hyperfine coupling constants are determined from the frequencies measured without DC Stark voltage. The results for $v_{o}$, the electric quadrupole coupling constant eqQ(Br) and eqQ(D), the spin-rotation coupling constants $C^{Br}$ and $C^{D}$, and the tensorial spin-spin coupling constant $d_{T}$ are given below. For the measurement of the Stark splittings a well defined de voltage was applied to one plate and a modulating square-wave voltage to the other plate. The well-known dipole moment of carbonyl sulphide, $\mu$ (OCS) = 0.71512(5) D was used to calibrate the Stark-field. The results for the electric dipole moment of the molecules are also given below. [FIGURE] The transition frequency (in kHz), the hyperfine coupling constants (in kHz) and the electric dipole moment (in D) of D Br.
Description
$^{1}$C. Huiszoon and A. Dymanus, Phys. L. 21, 164 (1966). $^{2}$F. A. van Dijk and A. Dymanus, Chem. Phys. L. 4, 170 (1969).""
Author Institution: Department of Physics, University of Nijmegen
Author Institution: Department of Physics, University of Nijmegen