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Multiple-quantum NMR dynamics in the quasi-one-dimensional distribution of protons in hydroxyapatite

✍ Scribed by Gyunggoo Cho; James P. Yesinowski

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
501 KB
Volume
205
Category
Article
ISSN
0009-2614

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✦ Synopsis

Mukiple-quantum NMR dynamics are reported for the quasi-one-dimensional distribution of uniformly spaced proton spins in hydroxyapatite, CLJ,(OH)(PO,)~, using a phase-incremented even-order selective time-reversal pulse sequence. The initial increase of the effective size N with the preparation time for creation of multiplequantum coherences is linear, in qualitative (but not quantitative) agreement with calculations based upon an "incremental shell" model recently developed by Levy and Gleason. An upward curvature observed at longer preparation times is qualitatively ascribed to the incomplete isolation of the linear chains. Slight deficiencies of hydroxyl groups in the linear chain lead to a measurable decrease in the slope of the linear portion of the curve.

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