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Effect of glassy modes on electron spin-lattice relaxation in solid ethanol

Merunka, Dalibor; Kveder, Marina; Jokić, Milan; Rakvin, Boris (2013) Effect of glassy modes on electron spin-lattice relaxation in solid ethanol. Journal of Magnetic Resonance, 228 . pp. 50-58. ISSN 1090-7807

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Electron spin-lattice relaxation (SLR) of TEMPO radical was measured in the crystalline and glassy states of deuterated ethanol in the temperature range 5-80 K using X-band electron paramagnetic resonance (EPR). The measured SLR rates are higher in the glassy than in crystalline state and the excess SLR rate in glassy state is much lower than in ethanol. This result suggests that extra modes in glassy state, i.e. glassy modes, produce the excess SLR rate via the electron-nuclear dipolar (END) interaction between the electron spin of radical and the matrix protons or deuterons. Using the soft-potential model and assuming the END interaction between the electron spin and the matrix protons, the contributions to SLR rate of various mechanisms of glassy modes were theoretically analyzed. The evaluations of SLR rates in glassy ethanol indicate two main mechanisms of glassy modes: thermally activated relaxation of double-well systems and phonon-induced relaxation of quasi-harmonic local modes. The SLR rates induced by these mechanisms correlate well with the experimental data.

Item Type: Article
Uncontrolled Keywords: glassy state; electron spin-lattice relaxation; glassy modes; soft-potential model
Subjects: NATURAL SCIENCES > Physics
NATURAL SCIENCES > Physics > Condensed Matter Physics
Divisions: Division of Physical Chemistry
Project titleProject leaderProject codeProject type
Molekulska struktura i dinamika sustava s paramagnetskim česticama-Marina Ilakovac-Kveder098-0982915-2939MZOS
Samo-udruživanje u gelovima i sinteza funkcionalnih hibridnih materijala-Leo Frkanec098-0982904-2912MZOS
Depositing User: Marina Ilakovac Kveder
Date Deposited: 17 Apr 2019 10:49
DOI: 10.1016/j.jmr.2012.12.016

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