On the Intramolecular Quadrupole Mechanism of Nuclear Magnetic Relaxation in the Gas Phase

1973 ◽  
Vol 51 (23) ◽  
pp. 2488-2494 ◽  
Author(s):  
B. C. Sanctuary
Keyword(s):  
Gas Phase ◽  
Nuclear Spin ◽  
Magnetic Relaxation ◽  
Nuclear Magnetic Relaxation ◽  
Relaxation Rates ◽  
Nuclear Spins ◽  
Nuclear Quadrupole ◽  
Intramolecular Mechanism ◽  
Nuclear Magnetic

By use of a nuclear quadrupole intramolecular mechanism, expressions are obtained for the relaxation rates for both ortho and para X2 molecules which have nuclear spins I1 > 1/2. It is found, except for I1 = 1, that as a result of the nuclear spin weightings the two species relax with different rates, even at temperatures high enough so that the rotational averages are approximately equal.

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.

scholarly journals Protein dynamics from nuclear magnetic relaxation

2016 ◽  
Vol 45 (9) ◽  
pp. 2410-2422 ◽  
Author(s):  
Cyril Charlier ◽  
Samuel F. Cousin ◽  
Fabien Ferrage
Keyword(s):  
Protein Dynamics ◽  
Magnetic Relaxation ◽  
Nuclear Magnetic Relaxation ◽  
Relaxation Rates ◽  
P Protein ◽  
Nuclear Magnetic

Protein dynamics are explored by a variety of methods designed to measure nuclear magnetic relaxation rates.

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