A migration to another open source infrastructure is planned. This will include web hosting for http://www.nmr-relax.com, source code repositories, bug and other trackers, new reports, download pages, and possible a svn to git conversion.
This is the original Luz and Meiboom 1963 relaxation dispersion model for 2-site fast exchange for SQ CPMG-type data. This model is labelled as LM63 in elax.
Parameters
The LM63 model has the parameters {R20, ..., Φex, kex}.
Reference
The reference for the LM63 model is:
Luz, Z. and Meiboom, S. (1963). Nuclear magnetic resonance study of protolysis of trimethylammonium ion in aqueous solution - order of reaction with respect to solvent. J. Chem. Phys., 39(2), 366-370. (DOI: 10.1063/1.1734254)