Stray-field imaging of quadrupolar nuclei of half integer spin in solids

✍ Scribed by Philippe Bodart; Teresa Nunes; Edward W. Randall

• Book ID: 104357848
• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 580 KB
• Volume: 8
• Category: Article
• ISSN: 0926-2040
• DOI: 10.1016/s0926-2040(97)00005-2

✦ Synopsis

A report is presented on the observation of Hahn echoes from the following quadrupolar nuclei of half integer spin (I) in polycrystalline solids in the large static magnetic field gradient (37.5 T/m) which exists in the fringe field of a superconducting solenoid: 7Li, 23Na, "B, '%u (I = 3/2); 27A1 (I = 5/2); 51V, 59Co (I = 7/2); and "'In (I = 9/2). 23Na echo-trains from NaCl (with non-selective excitation) and from Na,SO, (with selective excitation) are compared quantitatively for two different RF pulse sequences: 90,-(7-90,-T-echo-), and 90,-(T-90,-T-echo-1,. The signals obtained from RF pulses corresponding to non-selective 90" pulses were shown to be quantitative, whereas in the selective case smaller signals were obtained since only the central transition contributed. The loss of signal from this cause can be distinguished from small signals resulting from low density of nuclei by use of the second sequence. A 7Li image obtained from LF in a cylindrical glass-vial is shown. 0 1997 Elsevier Science B.V.