Nuclear magnetic relaxation for individual transitions of an AMX spectrum: Use of interference terms to determine signs of scalar coupling constants

1973 ◽  
Vol 22 (2) ◽  
pp. 568-571
Author(s):  
L Werbelow
Keyword(s):  
Magnetic Relaxation ◽  
Nuclear Magnetic Relaxation ◽  
Coupling Constants ◽  
Scalar Coupling ◽  
Nuclear Magnetic

Nuclear Magnetic Relaxation in a Gas of Regular Molecules

1970 ◽  
Vol 25 (8-9) ◽  
pp. 1169-1177 ◽  
Author(s):  
F.R. Mccourt ◽  
S. Hess
Keyword(s):  
Magnetic Relaxation ◽  
Collision Operator ◽  
Simple Expression ◽  
Spin Rotation ◽  
Nuclear Magnetic Relaxation ◽  
Scalar Coupling ◽  
Relaxation Processes ◽  
Molecular Symmetry ◽  
Effective Spin ◽  
Nuclear Magnetic

Abstract Nuclear magnetic relaxation (NMR) in a gas of regular (tetrahedral and octahedral) molecules from the point of view of the kinetic theory of transport and relaxation processes based on the Waldmann-Snider equation is considered. A simple expression is obtained for the spin-rotation interaction based on considerations of the molecular symmetry. The form of the spin-rotation coupling which contains, in addition to the so-called "scalar" coupling constant, also a scalar anisotropy part, ⊿c, of the spin-rotation coupling tensor determines, along with the collision operator, the form to be taken by an expansion of the nonequilibrium part of the distribution function-density matrix of the gas. Solutions of the set of coupled differential equations which follow upon application of the moment method to the linearized Waldmann-Snider equation lead to the Bloch equations which define the "spin-lattice" and transverse relaxation times in the gas. Those obtained here are com-parable with those obtained using correlation function theory. However, in this work, due to explicit consideration of the molecular symmetry, it is shown that the "effective" spin-rotation coupling coefficient found in tetrahedral and octahedral molecules is not the same and depends in a simple way on the number of equivalent spins in the molecule.

3He NUCLEAR MAGNETIC RELAXATION BEHAVIOURS IN HCP SOLID 3He WITH 4He IMPURITIES

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-115-C6-116 ◽  
Author(s):  
S. Maegawa ◽  
T. Mizusaki ◽  
Y. Hirayochi ◽  
T. Kusumoto ◽  
A. Hirai
Keyword(s):  
Magnetic Relaxation ◽  
Nuclear Magnetic Relaxation ◽  
Solid 3He ◽  
Nuclear Magnetic
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