T2>2*T1 components often appear in NMR T1-T2 map. Why?

Theoretically speaking, T2 can never be greater than 2*T1. (ref: https://dtrx.de/od/mmm/mmm_20180117.pdf). But why T2>2*T1 components often appear in NMR T1-T2 correlation maps?

29 November 2018 9,150 3 View