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Nuclear magnetic relaxation and random reorientations in molecular crystals
Author(s) -
Ivanov E. N.
Publication year - 1970
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19700420145
Subject(s) - dipole , relaxation (psychology) , condensed matter physics , spin–lattice relaxation , intermolecular force , nuclear magnetic resonance , molecule , lattice (music) , physics , chemistry , molecular physics , nuclear quadrupole resonance , quantum mechanics , psychology , social psychology , acoustics
Abstract A calculation is made of the half‐width of the nuclear magnetic resonance line Δω 1/2 and the spin‐lattice relaxation time T 1 in molecular crystals. It is suggested that the relaxation is due to the modulation of the intermolecular dipole–dipole interaction of random reorientations of molecules. The random reorientations of molecules in a crystal lattice are treated on the basis of the random rotational travelling model, earlier suggested by the author. Δω 1/2 and T 1 are found to be determined by the number of equilibrium reorientations of the molecule. For different elementary rotational angles (π/2, π/4, π/6) calculation formulae are given. The nature of random reorientations is discussed.