Dipolar broadening and exchange narrowing of EPR lines from the paramagnetic centers distributed on a solid surface |
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| Authors: | V. A. Atsarkin G. A. Vasneva V. V. Demidov F. S. Dzheparov B. M. Odintsov R. B. Clarkson |
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| Affiliation: | (1) Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Mokhovaya ul. 11, Moscow, 103907, Russia;(2) Institute of Theoretical and Experimental Physics, Bol’shaya Cheremushkinskaya ul. 25, Moscow, 117259, Russia;(3) Illinois Research EPR Center, University of Illinois, Urbana, IL 61801, USA |
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| Abstract: | Experiments with char samples provide support for the theory of EPR line shape in a system of surface paramagnetic centers with dipole-dipole interactions. It is also demonstrated that, if a strong Heisenberg exchange dominates over the dipole-dipole interactions, the EPR line of a two-dimensional system narrows and acquires Lorentzian shape, similar to the three-dimensional case. |
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