Fourier transform spectra of the monoisotopic species H370Ge35Cl and H374Ge37Cl have been recorded in the υ6 region near 600 cm-1 with a resolution of 0.04 cm-1. Rotational analyses based on ∼ 700 data for each isotopomer have been performed, and the excited state parameters υ60, A6, B6, Aζ6, η6J, η6K, D6k and F6 have been determined. The previously reported analysis of υ6 data of H374Ge35Cl has been repeated employing improved ground state constants, and a r.m.s. deviation of ~ 4 x 10-3 cm-1 has been achieved for the three different isotopic combinations, which show fully consistent excited state parameters.
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