Transverse relaxation times of spin 32 nuclei in the quadrupole nutation NMR experiment

✍ Scribed by Semiha Bahçeli; Jacek Klinowski

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 782 KB
• Volume: 2
• Category: Article
• ISSN: 0926-2040
• DOI: 10.1016/0926-2040(93)90008-b

✦ Synopsis

Transverse relaxation times in the rotating frame of quadrupolar nuclei with half-integer spins are inversely proportional to the linewidth of quadrupole nutation NMR spectra. We apply fictitious spin -l/2 operators to I = 3/2 nuclei to derive correlations between the transitions of a multi-level system which affect nuclear relaxation. When wrf < wo, all possible multiple-quantum transitions contribute to the transverse quadrupolar relaxation time in the rotating frame TZop. When OJ,~ > OJ~, two of the three single-quantum transitions do not contribute. In the low-temperature region (outside the extreme narrowing limit), the contribution of double-and triple-quantum coherences to Tzap goes through a minimum for w,~ < wQ, while the triple-quantum coherence appears at zero frequency and corresponds to a short transverse relaxation time for w,~ B oQ.