Showing papers by "Larry R. Dalton published in 1972"
TL;DR: In this article, it was shown that the EPR spectra from very slowly tumbling nitroxide radicals have been found to be sensitive in shape to the molecular motion, even though they are substantially identical with that from a rigid powder.
141 citations
TL;DR: In this article, a quantitative simulation of the electron nuclear double resonance (ENDOR) spectra of randomly oriented molecules is discussed with particular attention paid to those systems where electron cross relaxation effectively couples the spin packets of the EPR spectrum.
Abstract: The quantitative simulation of the electron nuclear double resonance (ENDOR) spectra of low‐symmetry, randomly oriented molecules is discussed with particular attention paid to those systems where electron cross relaxation effectively couples the spin packets of the electron paramagnetic resonance (EPR) spectrum. ENDOR transition frequencies are calculated employing the high field approximation; frequency shifts arising from g anisotropy and the SxIx and SyIy terms of the hyperfine Hamiltonian are then evaluated by perturbation theory. ENDOR signal intensities are considered to be determined by transition moments and by electron and nuclear spin relaxation processes. The ENDOR spectra of polycrystalline samples of the x‐irradiated aliphatic diacids, HOOC(CH2)nCOOH where n=1 to 8, and the alicyclic diacids, (CH2)mC(COOH)2 where m=2 to 4, have been recorded at 4.2°K and theoretical spectra computed. Reasonably good agreement is observed between experimental spectra and spectra computed assuming complete cou...
61 citations
17 citations