Article

NMR relaxation study of methyl groups in solids from low to high temperatures

Concepts in Magnetic Resonance Part A (impact factor: 1.67). 09/2005; 27A(1):38 - 53. DOI:10.1002/cmr.a.20040 pp.38 - 53

ABSTRACT The calculation of the correlation functions of complex motion consisting of jumps over the barrier (classical motion) and jumps through the barrier (incoherent tunneling) is presented. The Schrödinger equation has been applied in the calculation of the rate constant of tunneling jumps through the barrier. This rate constant determines directly the temperature at which incoherent tunneling ceases. The calculated spectral densities are applied to analyze the temperature dependencies of the spin-lattice relaxation rate in solids containing a methyl group. © 2005 Wiley Periodicals, Inc. Concepts Magn Reson Part A 27A: 38–53, 2005.

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Keywords

calculated spectral densities
 
classical motion
 
incoherent tunneling
 
incoherent tunneling ceases
 
methyl group
 
Schrödinger equation
 
solids
 
spin-lattice relaxation rate
 
temperature dependencies
 
© 2005 Wiley Periodicals