Phonon interactions with methyl radicals in single crystals | Zendy

James W. Wells | Zendy

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Phonon interactions with methyl radicals in single crystals

Author(s) -

James W. Wells

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4982735

Subject(s) - phonon , quantum tunnelling , condensed matter physics , population , relaxation (psychology) , spectral line , atomic physics , electron , amplitude , spin states , methyl group , dipole , chemistry , spin (aerodynamics) , electron paramagnetic resonance , molecular physics , chemical physics , materials science , nuclear magnetic resonance , physics , group (periodic table) , psychology , social psychology , demography , quantum mechanics , sociology , thermodynamics , organic chemistry , astronomy

The high temperature ESR spectra’s anomalous appearance at very low temperatures for the methyl radical created in single crystals is explained by magnetic dipole interactions with neighboring protons. These protons acting via phonon vibrations induce resonant oscillations with the methyl group to establish a very temperature sensitive ‘‘relaxation’’ mode that allows the higher energy ‘‘E’’ state electrons with spin 12 to ‘‘decay’’ into ‘‘A’’ spin 12 states. Because of the amplitude amplification with temperature, the ‘‘E’’ state population is depleted and the ‘‘A’’ state population augmented to produce the high temperature ESR spectrum. This phenomenon is found to be valid for all but the very highest barriers to methyl group tunneling. In support, a time dependent spin population study shows this temperature evolution in the state populations under this perturbation

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