The use of differential transverse relaxation to detect mobile species in solids

B. C. Gerstein, Jian Zhi Hu, Jinuan Zhou, Chaohui Ye, Mark Solum, Ronald Pugmire, David M. Grant

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Delayed acquisition of the proton NMR in selected organic molecular solids (L-alanine, durene, ethyl fumarate, and p-hydroxybenzoic acid) is shown to allow the observation of mobile species in the presence of relatively rigid bulk molecules. The mobility is found to be thermally activated. The combination of the thermally activated motion and magic-angle spinning leads to a fraction of these species moving nearly isotropically on the time scale of the inverse of the homonuclear dipolar splitting. In the case of ethyl fumarate and alanine, there exist populations with differing values of T1 and T. This indicates the co-existence of relatively rigid and relatively mobile molecules in the same sample. The intensities under delayed acquisition cannot always be trusted to yield quantitative information. Comparison of spectra taken under delayed acquisition and under the CRAMPS (B.C. Gerstein, R.G. Pembleton, R.C. Wilson and L.M. Ryan, J. Chem. Phys., 66 (1977) 361) technique is made.

Original languageEnglish (US)
Pages (from-to)63-71
Number of pages9
JournalSolid State Nuclear Magnetic Resonance
Issue number1
StatePublished - Feb 1996
Externally publishedYes


  • Differential transverse relaxation
  • Mobile species

ASJC Scopus subject areas

  • Radiation
  • General Chemistry
  • Nuclear and High Energy Physics
  • Instrumentation


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