ESR Spectra from Paramagnetic Centers in Irradiated KClO4. I. The ClO2 Center

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Abstract
Accurate spin Hamiltonians for one paramagnetic center in irradiated KClO4 are derived from ESR spectra at five temperatures in the range from −170° to 0°C. The quadrupole interaction gives rise to ``forbidden'' transitions of high intensity. An iterative procedure is used for computation of the principal values of the g tensor as well as the tensors for the magnetic and electric hyperfine interaction. Comparison of the low‐temperature spin Hamiltonian for the center with that derived from microwave spectra for the free ClO2 molecule demonstrates that the center is adequately described in terms of a trapped ClO2 molecule as previously suggested by Cole. A pronounced temperature dependence of the spin Hamiltonian indicates a considerable influence of the host lattice.