Electron Spin Resonance of Zn(ClO4)2·6H2O:Mn2+ in a Parallel and Perpendicular Configuration

Abstract

ESR measurements of Zn${\left(\mathrm{C}\mathrm{l}{\mathrm{O}}_4\right)}_2$·6${\mathrm{H}}_2$O:${\mathrm{Mn}}^{++}$ are presented for experimental arrangements in which the static magnetic field is parallel as well as perpendicular to the microwave magnetic field. A comparison of the spectra for these two configurations yields a simple, direct determination of the relative signs of the parameters $D$ and $A$, and $D$ and $B$. Relative transition probabilities for the parallel-field case are calculated and found to have a particularly simple form. The values in gauss of the parameters in the spin Hamiltonian are $D=\pm 127\pm 1$, $a=\pm 9.5\pm 1$, $A=\mp 95.8\pm 0.3$, $B=\mp 96.1\pm 0.3$, and $E=0\mathrm{}$; $g$ is found equal to 1.999±0.001.