Proton double quantum coherence and cross-relaxation in (NH4)(2)SnBr6

: Punkkinen M, Kaikkonen A, Ylinen EE, Kankaanpaa M, Vuorimaki AH

Publisher: ELSEVIER SCIENCE BV

: 1998

Solid State Nuclear Magnetic Resonance

SOLID STATE NUCLEAR MAGNETIC RESONANCE

: SOLID STATE NUCL MAG

: 13

: 3

: 167

: 173

: 7

: 0926-2040

DOI: https://doi.org/10.1016/S0926-2040(98)00083-6

A proton double quantum coherence signal can be observed exclusively from the T species NH4 groups (with the total spin I = 1 in ammonium compounds at low temperatures by the three-pulse sequence 90 degrees(x) - t(pr) - 90 degrees(x) - t(ev) - 90 degrees(x) - t(a),where t(pr) and t(a) are of the magnitude of the inverse line width and t(ev) very short. The usefulness of this pulse sequence, preceded by the additional pulse sequence 90 degrees(x) - t(1) - 90 degrees(-x) - t(2) for creating an unbalance between the A and T species magnetizations, by applying it to cross-relaxation studies in (NH4)(2)SnBr6. (C) 1998 Elsevier Science B.V. All rights reserved.

Physical sciences