title: Simple modeling of dipolar coupled 7Li spins and stimulated-echo spectroscopy of single-crystalline beta-eucryptite.
abstract: Stimulated-echo spectroscopy has recently been applied to study the ultra-slow dynamics of nuclear spin-3/2 probes such as 7Li and 9Be in solids. Apart from the dominant first-order quadrupolar interaction in the present article also the impact of the homonuclear dipolar interactions is considered in a simple way: the time evolution of a dipole coupled pair of spins with I = 3/2 is calculated in an approximation, which takes into account that the satellite transitions usually do not overlap. Explicit analytical expressions describing various aspects of a coupled quadrupolar pair subjected to a Jeener-Broekaert pulse sequence are derived. Extensions to larger spin systems are also briefly discussed. These results are compared with experimental data on a single-crystalline Li ion conductor.
authors.affiliation: Experimentelle Physik III, Universität Dortmund, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Qi
authors.forename: G
authors.initials: G
authors.lastname: Diezemann
authors.forename: H
authors.initials: H
authors.lastname: Böhm
authors.forename: J
authors.initials: J
authors.lastname: Lambert
authors.forename: R
authors.initials: R
authors.lastname: Böhmer