Quadrupole hyperfine structure in the rotational transitions of and labeled by the total angular momentum quantum numbers. The relative intensities and center frequency positions are reproduced accurately in the figure; however, the width of each transition has been magnified 250 times relative to the frequency scale to illustrate the Doppler splittings of . 200 gas pulses were summed for each transition.
The overlapping and transitions in the spectrum of obtained by summing 600 gas pulses. Both doublets have a Doppler splitting of .
Measured hyperfine components in the and transitions in HSiBr.
Molecular constants of and in the ground state (in MHz). Standard error given in parentheses. The values of and were fixed at and , respectively, in the fit of both isotopomers using LIF data (Ref. 1).
Trends in the ionic and character of Si–Br, Si–Cl, C–Br, and C–Cl bonds in various molecules.
Comparison of ab initio quadrupole parameters calculated at various levels of electron correlation. All calculations done at the experimental geometry of Ref. 1. Nuclear quadrupole coupling constants were obtained using barns as the nuclear quadrupole moment of .
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