Abstract
The far-infrared spectrum of methylene chloride has been recorded in the region between 10 and 75 cm −1 with a resolution of 0.002 cm −1. Microwave spectra in the frequency range 26–40 GHz have also been recorded. Rotational transitions in the ground states of CH 2 35Cl 2 and CH 2 35Cl 37Cl and in the v 4 = 1 vibrational state of CH 2 35Cl 2 have beem measured and assigned. Simultaneous analyses of these transitions and of microwave data have been performed. Improved values for the quartic and sextic centrifugal distortion constants of the ground state of CH 2Cl 2 have been obtained, while some octic distortion constants never reported before in the literature have been determined. For the first time, precise rotational and centrifugal distortion constants have been obtained for the ground state of CH 2 35Cl 37Cl and for the v 4 = 1 state of CH 2 35Cl 2.
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