Nuclear magnetic relaxation in porous media: The role of the mean lifetime τ(ρ,D)

1991 ◽  
Vol 44 (10) ◽  
pp. 4960-4973 ◽  
Author(s):  
David J. Wilkinson ◽  
David Linton Johnson ◽  
Lawrence M. Schwartz
Keyword(s):  
Porous Media ◽  
Magnetic Relaxation ◽  
Nuclear Magnetic Relaxation ◽  
Mean Lifetime ◽  
The Mean ◽  
Nuclear Magnetic

On the Role of Nuclear Spin Symmetry of Symmetric Top Molecules in Gas Phase Nuclear Magnetic Relaxation

1974 ◽  
Vol 52 (5) ◽  
pp. 387-395 ◽  
Author(s):  
B. C. Sanctuary
Keyword(s):  
Nuclear Spin ◽  
Magnetic Relaxation ◽  
Spin Symmetry ◽  
Nuclear Magnetic Relaxation ◽  
The Difference ◽  
Symmetric Top Molecules ◽  
Spin Species ◽  
Zero Frequency ◽  
Nuclear Magnetic

For symmetric top molecules the role of nuclear spin symmetry is included in the derivation of the nuclear magnetic relaxation rate. It is assumed that this is dominated by a spin-rotation mechanism. Of the three nuclear spin species which exist for ZX3Y' symmetric tops, it is found that the "zero frequency" K = −1 to +1 term results in two of the species relaxing with a different rate from the third. The difference, which allows a direct NMR evaluation of the relative values of [Formula: see text] and [Formula: see text], is enhanced at low temperatures.

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