Demonstrating the Spatial Resolution of Field Gradient NMR

✍ Scribed by T. Feiweier; B. Geil; O. Isfort; F. Fujara

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 211 KB
• Volume: 131
• Category: Article
• ISSN: 1090-7807
• DOI: 10.1006/jmre.1997.1349

✦ Synopsis

In recent years, field gradient NMR has become a method of fraction of the sample we can selectively look at. Rather, increasing importance in measuring very small dislocations of molwe examine the sample as a whole and use the dynamics of ecules. Rough estimations indicate that, by utilizing large field a moving spin species to explore structure and dynamics on gradients, one should be able to detect motions down to the 10a microscopic scale. In this case, one would better speak of nm scale. However, this limit has not yet been experimentally a ''dynamical spatial resolution,'' thus also referring to the detected. In this paper, we present a method that allows the direct terminology of ''dynamical imaging'' sometimes applied for measurement of the spatial resolution of field gradient NMR. For this technique.

our experimental setup, utilizing an extremely large static field

By quantitatively evaluating the effect oscillations have on gradient of about 180 T m 01 , we find a lower limit of 7 nm, thus field gradient NMR, we also gain insight into the influence for the first time confirming the expected resolution. Furthermore, of unwanted vibrations by various sources (e.g., building we discuss the effect of unwanted vibrations as a limiting factor of the method. ᭧ 1998 Academic Press vibrations). These turn out to impose limits on the experi-