Abstract

The nuclear hyperfine structure in the J=1←0 transitions of the four isotopomers 79Br35Cl, 79Br37Cl, 81Br35Cl and 81Br37Cl has been observed in the vibrational states ν=0 and ν=1 by pulsed-nozzle, Fourier-transform microwave spectroscopy. Accurate values of the nuclear quadrupole coupling constants χνaa(X), where X=Br or Cl, and the spin-rotation coupling constants Mνbb(X) are determined from the spectra. Equilibrium values χνaa(X) and Mebb(Br) are derived from the vibrationally averaged quantities and the former lead to precise isotopic ratios, Q(79Br)/Q(81Br) = 1.197048(3) and Q(35Cl)/Q(37Cl) = 1.26889(3) for the nuclear electric quadrupole moments.

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