Nuclear Magnetic Resonance Methods for Determining Chemical-Exchange Rates1

1966 ◽  
Vol 88 (14) ◽  
pp. 3185-3194 ◽  
Author(s):  
Adam Allerhand ◽  
H. S. Gutowsky ◽  
J. Jonas ◽  
R. A. Meinzer
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Exchange ◽  
Nuclear Magnetic

Chemical exchange at the ferroelectric phase transition of lead germanate revealed by solid state 207Pb nuclear magnetic resonance

2019 ◽  
Vol 21 (3) ◽  
pp. 1100-1109 ◽  
Author(s):  
Claudia E. Avalos ◽  
Brennan J. Walder ◽  
Jasmine Viger-Gravel ◽  
Arnaud Magrez ◽  
Lyndon Emsley
Keyword(s):  
Phase Transition ◽  
Nuclear Magnetic Resonance ◽  
Solid State ◽  
Magnetic Resonance ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
Chemical Exchange ◽  
Lead Germanate ◽  
Mixed Order ◽  
Nuclear Magnetic

Multi-dimensional NMR is used to quantitatively identify a mixed order–disorder and displacive mechanism for the ferroelectric phase transition of lead germanate.

Nuclear magnetic resonance studies of multi-site chemical exchange. I. Matrix formulation of the Bloch equations

1970 ◽  
Vol 48 (23) ◽  
pp. 3641-3653 ◽  
Author(s):  
L. W. Reeves ◽  
K. N. Shaw
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Exchange ◽  
Relaxation Times ◽  
Bloch Equations ◽  
Matrix Formulation ◽  
Exchange Processes ◽  
Site Exchange ◽  
Saturation Effects ◽  
Nuclear Magnetic

A concise matrix formulation of chemical exchange effects on a nuclear magnetic resonance (n.m.r.) spectrum using the Bloch equations is described. The method accommodates many-site exchange processes, site-dependent relaxation times, differing site populations, and saturation effects in a steady-state first-order spectrum. The simple two-site exchange system is analyzed in detail and saturation effects in this system are studied numerically. Alternative forms of the basic lineshape equation are derived, all of which are readily adapted to efficient computer calculations for complete lineshape fitting to obtain kinetic data for complicated chemical exchange processes.

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