ESR of hydrazyl radicals in frozen solutions and glasses

DPPH as a Standard for High-Field EPR

“…In any case, the result presented in this paper should be considered as a benchmark for further studies, and expected with increasing Larmor frequency and was indeed 210 COMMUNICATIONS experimentally observed (17, 18). This is exactly what hap-spectra is on the order of 0.94 mT and similar to that obtained from the X-band experiments (19,20). As expected in a pens in our experiment between the X band and the Q band and tells us that in that frequency range we are in a regime solution spectrum, the g-factor anisotropy remains averaged out by the Brownian motions and molecular tumbling.…”

“…In fact, Fig. 1 illustrates well the usefulness of this standard: in both over the aromatic rings as determined by polarized neutron diffraction (19), EPR (20,21), and ENDOR (21) data. In spectra, the magnetic field is calculated from the nonpersistent sweep coil current added to the persistent current in the the first case, the calculated second moment M 2 was 166.02 mT 2 and in the second case it was 749.79 mT 2 .…”

Application of the method of projective representations to the analysis of exciton-phonon transitions in enantiomorphous tetragonal crystals ZnP2 and CdP2

“…To calculate selection rules and to ascertain whether the mentioned points are those of band extremums, it is necessary to know irreducible representations of wavevector groups. The irreducible representations of the wavevector groups can be found using the method of projective representations [1,3].…”

“…The merging and duplication of representations are caused by the invariance with respect to the time inversion and governed by the Herring criterion [4]. The projective representations for Λ, S, V, Σ, Δ, W, and U points depend on the wavevector [3]. Their evolution in certain direction can be pictured graphically as shown in Fig.…”