''Φ<sub>ex</sub>''<noinclude>
The fast exchange factor, in rad2rad<sup>2</sup>.s<sup>-2</sup>. This is equal to:
{{:Phiex}} = pApBΔω2{{:pA}}{{:pB}}{{:deltaomega2}}
[[Category:Relaxation dispersion analysis]]
[[Category:Relaxation dispersion parameters]]
</noinclude>