The theory for the hyperfine structure in the rotational spectrum of symmetric-top molecules containing three identical quadrupolar nuclei is discussed. Formulas and tables are given from which the quadrupole interaction energies, and the transition frequencies and intensities can be calculated for the case of nuclear spin 32. The theory is applied to the molecules CF35Cl3 and CH35Cl3 with completely satisfactory results. The bond-axis quadrupole coupling constants determined for CF35Cl3 and CH35Cl3 are −79.9±0.6 Mc/sec and −77.9±0.5 Mc/sec, respectively. Rotational constants were determined for four rotational transitions of each molecule, and the results are in agreement with centrifugal-distortion theory.
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