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Type: Artigo de periódico
Title: Spin-lattice Relaxation Of A Nitroxide Radical In A Single Crystal
Author: Wajnberg E.
Alonso A.
Nascimento O.R.
Tabak M.
Abstract: Spin-lattice relaxation time, T1 of tanol (protonated and deuterated), in crystal matrix of 4-hydroxy-2,2,6,6-tetramethylpiperidine has been studied in the range 10-300 K. Continuous saturation technique was applied to inhomogeneous broadened ESR signals. For tanol-p a transition was observed at 133 K due to the freezing of methyl rotations: line broadening was observed in y- and x-axis directions. T-1 1 was fitted to either of two expressions ATn + C and B exp(Δ/kT) + D. At 20 K the main contribution is due to a constant term (cross-relaxation effect) and is the same for both radicals. Above 100 K the effect of temperature-dependent terms became predominant. Fitting of data does not permit to make a clear choice between the Tn and exponential models. © 1992.
Rights: fechado
Identifier DOI: 10.1016/0009-2614(92)80056-H
Date Issue: 1992
Appears in Collections:Unicamp - Artigos e Outros Documentos

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