MOLECULAR BEAM MEASUREMENT OF THE HYPERFINE STRUCTURE OF TIBr.
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Date
1967
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
We have measured radiofrequency transitions between h\'{i}s levels in the $J = 2$ and $J = 3$ states of TlBr. The measurements were made with a molecular beam electric resonance $spectrometer^{1}$ under conditions of very weak electric and magnetic fields. From the observed frequencies we have calculated the hyperfine interaction constants for the ground vibrational state of $^{205}Tl^{79}Br$ and $^{205}Tl^{81}Br$. These are; $\begin{array}{lrc}&^{205}T\ell^{79}Br & ^{205}T\ell^{81}Br\\eqQ_{Br} & 126.31 \pm 0.1 &105.52\pm0.1\, MHz\\c_{Br}&3.72\pm0.5 & 3.96\pm0.5\,kHz\\c_{TI} & 42.75\pm0.5 &42.57\pm0.5\,kHz\\c_{3}&-1.59\pm2.0&-1.74\pm2.0\,kHz\\c_{4} & -6.37\pm 2.0 & -7.23\pm2.0\, kHz\end{array}$ where $eqQ_{Br}$ is the quadrupole coupling constant for the bromine nucleus, $C_{Br}$ and $C_{Tl}$ are the spin-rotation coupling constants for the bromine and thallium nuclei, respectively, and $C_{3}$ and $C_{4}$ are the coupling constants for the tensor and scalar parts of the nuclear spin-spin interaction. The values of $eqQ_{Br}$ are in agreement with, but more precise than those obtained by $Fitzky^{2}$ with microwave absorption spectroscopy. The magnetic coupling constant had not been measured previously. Measurements are being continued on the $J = 1$ and $J>3$ states, the excited vibrational states, and on the accompanying lines for the $^{203}Tl$ isotope. Work of the same nature is being done on TlI, but analysis of the observed spectrum is still in progress.
Description
This research was supported in part by the U.S. Atomic Energy Commission. $^{1}$ J. C. Zorn, T. C. English, J. T. Dickinson, and D. A. Stephenson, J. chem., Phys. 45, 3731 (1966). $^{2}$ H. G. Fitzky, Z. Physik 151, 351 (1958).
Author Institution: Randall Laboratory of Physics, The University of Michigan
Author Institution: Randall Laboratory of Physics, The University of Michigan