Microwave Spectrum of Chloroform

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Abstract
A theoretical and experimental examination of the J=2→3 transition in CHCl335 permits the evaluation of the quadrupole coupling constant of the molecule as eQVzz=28.70±.08 Mc, and provides an improved value of the rotational constant, B=3302.41±.03 Mc. Two centrifugal distortion coefficients are also obtained: DJ=4.12±.43 kc and DJK=55±7 kc. The J=2→3 transitions in CHCl235Cl37 yield the following, revised structural parameters for chloroform: C–H=1.073 A, C–Cl=1.762 A, and Cl–C–Cl=110°55′. With the assumption of axial charge symmetry about the C–Cl bond direction, a, the revised bond angle gives eQVaa=‐80.39±.22 Mc for the quadrupole coupling constant in CHCl335.