This is the analytic CR72 model for 2-site exchange on most times scales (Section 11.3.4 on page ) extended for multiple types of multiple quantum data (MMQ) by Korzhnev et al. (2004a).
It is selected by setting the model to `MMQ CR72'.
The simple constraint
pA > pB is used to halve the optimisation space, as both sides of the limit are mirror image spaces.
The equation for the exchange process is
R2eff = ℜ(λ1) - |
(11.44) |
where
λ1 | = R2, MQ0 + |
(11.45) |
D± | = |
(11.46) |
η± | = 2 |
(11.47) |
Ψ | = |
(11.48) |
ζ | = - 2Δω |
(11.49) |
and where
Q = ℜ |
(11.50) |
and
mD± | = ± |
(11.51) |
mZ |
= ± |
(11.52) |
and
d± | = |
(11.53) |
z± | = |
(11.54) |
The symbol δ is half of τCPMG or
δ = |
(11.55) |
The references for this model are:
More information about the MMQ CR72 model is available from:
The relax user manual (PDF), created 2024-06-08.