Experimental Determination of Four-Time Stimulated Echoes in Liquids, Colloidal Suspensions, and Crystals

✍ Scribed by G. Hinze; R. Böhmer; G. Diezemann; H. Sillescu

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 155 KB
• Volume: 131
• Category: Article
• ISSN: 1090-7807
• DOI: 10.1006/jmre.1998.9999

✦ Synopsis

Four-time stimulated echo experiments have been used to monithe relevant strength of the chemical shift anisotropy or tor the temporal evolution of the reorientation rates of deuterated quadrupolar interaction, respectively. This constraint is usumolecules or colloidal suspensions. We present extended phase ally necessary in order to be sensitive to sufficiently small cycles for this seven-pulse experiment. In order to test its perforjump angles. Furthermore if t p is not short compared to t m1 mance three vastly different materials are chosen. These include then matters can become very complicated. This is due to a crystal in which the molecules carry out well-defined 180Њ flips the fact that then the rotational dynamics taking place during and a supercooled liquid characterized by a distribution of jump t p cannot be neglected. On the other hand, t p should be short angles centered around 10Њ. As an example for rotational diffusion, since in the temperature ranges of interest the transverse spin data on a concentrated suspension of polystyrene spheres in a states which exist during the evolution and detection periods viscous medium are presented. ᭧ 1998 Academic Press typically dephase relatively quickly. The theoretical description of multidimensional NMR investigations has received considerable attention in the literature (8-12). In particular