DOI: 10.1063/1.1731340. Theory of ESR Linewidths of Free Radicals

Theory of ESR Linewidths of Free Radicals

10.1063/1.1731340

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

A theory of ESR linewidths for substances in which the magnetic anisotropy is small and for which the orbital magnetism has been essentially quenched is developed. Nuclear quadrupole moments, zero field splittings, anisotropic Zeeman terms, and intramolecular electron-nuclear dipolar interactions, as well as motional and exchange effects are considered in the strong field case. The theory is developed in a manner that is particularly adaptable to the study of liquids but it is also applied to crystals since the resulting equations, though only applicable for small anisotropies, are particularly simple. The theory provides an extension of previous theories on ESR spectra in liquids. Several applications of the theory are discussed with particular emphasis on V4+ chelates. The theory of exchange in liquids, a phenomenon which is complicated by the noncommutivity of the motional and exchange Hamiltonians is considered in special detail. It is shown that this theory can be used to explain Hausser's results—the existence of an optimum viscosity for the observation of hyperfine structure.

Bibliography

Kivelson, D. (1960). Theory of ESR Linewidths of Free Radicals. The Journal of Chemical Physics, 33(4), 1094â1106.

Authors 1

Daniel Kivelson (first)

References 53 Referenced 812

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Dates

Type	When
Created	20 years, 7 months ago (Jan. 5, 2005, 9:43 p.m.)
Deposited	1 year, 6 months ago (Feb. 8, 2024, 2:37 p.m.)
Indexed	1 month ago (July 30, 2025, 11:27 a.m.)
Issued	64 years, 11 months ago (Oct. 1, 1960)
Published	64 years, 11 months ago (Oct. 1, 1960)
Published Print	64 years, 11 months ago (Oct. 1, 1960)

Funders 0

None

BibTeX

@article{Kivelson_1960, title={Theory of ESR Linewidths of Free Radicals}, volume={33}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.1731340}, DOI={10.1063/1.1731340}, number={4}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Kivelson, Daniel}, year={1960}, month=oct, pages={1094–1106} }

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