Difference between revisions of "No Rex"

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For '''on-resonance''' models, f.ex [[M61]], (see also [[Relax_disp.spin_lock_offset%2Bfield | relaxx disp.spin lock offset+field]] )), if
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For '''on-resonance''' models, f.ex [[M61]], (see also [[Relax_disp.spin_lock_offset%2Bfield | relaxx disp.spin lock offset+field]] )), if <br>
 
<math>
 
<math>
 
\bar{\Omega}_{S,i} = 0.0
 
\bar{\Omega}_{S,i} = 0.0

Revision as of 14:09, 15 November 2015

The relaxation dispersion model for no chemical exchange. This if for all SQ CPMG-type data, MMQ CPMG-type data, and R1rho-type data. This model is labelled as No Rex in relax.

Parameters

The No Rex model has the parameter R20 or R' depending on the data type.

Equation for No Exchange in CPMG

[math] R_{2,\textrm{eff}} = R_2^0 [/math]

Equation for No Exchange in R1rho

[math] \mathrm{R}_{1\rho}= \mathrm{R}_1\cos^2\theta + \mathrm{R}_{1\rho}{´} \sin^2\theta [/math]

If no R1 values has been loaded, but the R1_fit flag has been turned on, the R1 will be fitted as well.


For on-resonance models, f.ex M61, (see also  relaxx disp.spin lock offset+field )), if
[math] \bar{\Omega}_{S,i} = 0.0 [/math]

then [math] \theta = \frac{\pi}{2} [/math]

and as such [math] cos^2\theta = cos^2(\frac{\pi}{2}) [/math]

Reference

These is no reference for the No Rex model.

Links

The implementation of the No Rex model in relax can be seen in the:

See also