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= Intro = The Carver and Richards 1972 2-site relaxation dispersion model for [[SQ CPMG-type data]] for most time scales whereby the simplification $R_{2A{:R2Azero}}^0$ = $R_{2B{:R2Bzero}}^0$ is assumed. This model is labelled as '''CR72''' in [[Relaxation dispersion citation for relax|relax]].

<math>k_{\textrm{EX:kex}}</math> is the chemical exchange rate constant, <math>p_A</math> {{:pA}} and <math>p_B</math> {{:pB}} are the populations of states A and B, and <math>\Delta \omega</math> {{:Deltaomega}} is the chemical shift difference between the two states in ppm.

The CR72 model has the parameters {$R_2^0${{:R2zero}}, $...$, $p_A${{:pA}}, $\Delta\omega${{:Deltaomega}}, $k_{ex{:kex}}$}.

The library code.<br>http://svn.gna.org/viewcvs/*checkout*/{{relax/trunk/url|path=lib/dispersion/cr72.py?revision=HEAD}}

* Carver, J. and Richards, R. (1972). General 2-site solution for chemical exchange produced dependence of T2 upon Carr-Purcell pulse separation. ''J. Magn. Reson.'', '''6'''(1), 89-105. ([http{{#lst://dx.doi.org/10.1016/0022-2364(72)90090-X 10.1016/0022-2364(72)90090-X]).Citations|CarverRichards72}}

* [http://www.nmr-relax.com/manual/reduced_CR72_2_site_CPMG_modelThe_reduced_CR72_2_site_CPMG_model.html relax manual],

[[Category:Models]][[Category:Dispersion models]][[Category:Relaxation_dispersionanalysis]]