Slow diffusion by singlet state NMR spectroscopy.
Small diffusion coefficients can be measured by using populations of singlet states that have a relaxation time constant, T(s), which can be much longer than the longitudinal relaxation time, T1. Spatial information can be encoded with pulsed field gradients in the manner of stimulated echo sequences. Singlet states can be excited via double-quantum coherences to enhance the efficiency of phase encoding and decoding.
Cavadini
Simone
S
Contribution from the Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, BCH, 1015 Lausanne, Switzerland.
Dittmer
Jens
J
Antonijevic
Sasa
S
Bodenhausen
Geoffrey
G