The TP02 2-site exchange R1ρ model

This is the model for 2-site exchange for off-resonance R1ρ-type data from Trott and Palmer (2002). It is selected by setting the model to `TP02'. The equation for the exchange process is

R1ρ = R1cos2θ + R1ρ'sin2θ + $\displaystyle {\frac{{\sin^2\theta p_{\textrm{A}}p_{\textrm{B}}\Delta\omega ^2\...
...omega_{\textrm{Beff}}^2/\omega_{\textrm{eff}}^2 + \textrm{k}_{\textrm{ex}}^2}}}$, (11.76)

in which

\delta_A &= \omega_{\textrm{A}}- \omega_{\text...
...left( \frac{\omega_1 }{\overline{\Omega}} \right).

The equation is accurate only when populations are highly skewed with pA $\gg$ pB. And it is valid only for exchange processes which are not fast. Note that this model has been superseded by the `TAP03' and `MP05' models. The reference for this equation is:

More information about the TP02 model is available from:

The relax user manual (PDF), created 2024-06-08.