Calculation of the Electron Spin Resonance Line Shape of Randomly Oriented Molecules in a Triplet State. II. Correlation of the Spectrum with the Zero-Field Splittings. Introduction of an Orientation-Dependent Linewidth
The structure in the electron-spin-resonance spectrum of randomly oriented molecules in a triplet state is due to resonance fields stationary with respect to a change in the molecular orientation. This is the basis for the derivation of the electron spin—spin coupling constants from such spectra. In this paper we investigate this structure with the help of a computer program which generalizes the one described in Part I to deal with the so-called ∆m=2 spectra. Some rules are derived for the interpretation of spectra. We then examine the possibility of including in such calculations the anisotropy of the electron g tensor and some dependence on the orientation of the linewidth. For the canonical orientations, the linewidth in a variable-magnetic-field experiment is shown not to depend on the microwave quantum.