Abstract
A microwave spectrometer designed for the study of the microwave spectra of corrosive fluorine compounds has been used to observe and measure a portion of the microwave spectrum of chlorine trifluoride. A number of transitions have been identified, and from these the moments of inertia and quadrupole coupling coefficients of both Cl35F3 and Cl37F3 obtained. An intensity alternation was observed showing that the ClF3 molecule has a C2v axis and is planar. The moments of inertia confirm this and further show that ClF3 has a distorted ``T'' structure with one short (1.598A) and two long (1.698A) ClF bonds. The angle between the two different kinds of ClF bonds is 87°29′. The quadrupole coupling coefficients χaa(Cl35F3)=−81·2 mc, χbb(Cl35F3)=−64·7 mc, χcc(Cl35F3)=146 mc agree with the observed frequency, f(Cl35F3)=75.1295 mc, of the pure quadrupole spectrum of ClF3, which corresponds to an eqQ of 150 mc.
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