QUADRUPOLE RELAXATION FOR A SPIN <i>I</i> = 3/2: THE F¹⁹ N.M.R. SPECTRA OF BF₃ AND ClO₃F

Abstract

An expression is derived for the broadening of the components of the quartet obtained for the n.m.r. spectrum of nuclei coupled to a nucleus of spin 3/2 undergoing electric quadrupole relaxation. It is shown that the F 19 spectra of BF 3 and ClO 3 F at various temperatures may be satisfactorily interpreted by means of this expression. Activation energies for molecular reorientation of 1.4 kcal/mole for BF 3 and 1.0 kcal/mole for ClO 3 F are obtained.