Quantitative NMR Using Large-volume 8mm MAS Probe:PASS Technique Overcomes Sample-spinning Limitation

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NM140008E

Large-volume 8mm MAS probes yield the  world-class sensitivity. On the other hand, their sample-spinning speed is confined to relatively slow one, raising spinning sidebands (SSBs) depending on nuclear species and samples. Accordingly, the center band intensity becomes comparatively low, and quantitative capability of the spectra may be lost, as well.
However, PASS (Phase Adjusted Spinning Sideband) technique retrieves the inherent  peak by acquiring the individual SSBs and  summing them up. The figure on the right  demonstrates 29Si MAS and PASS spectra for a glass sample. Comparison of MAS, TOSS, and PASS spectra in the figure below proves that PASS recovers the inherent intensity.

右図はガラス試料に対する29Si MASおよびPASSスペクトル
MAS、TOSS、PASSスペクトルの比較

PASS spectra do not split the center peak into SSBs so that quantitative capability is guaranteed. Site fraction, for example, can be determined via lineshape analysis.

Article giving more detailed description, “T. Nakai, New Glass, 28(2),17-28 (2013)” (in Japanese) is available. The request to sales or  sales promotion team is highly appreciated.

The sample courtesy of

Asahi Glass Co., Ltd.

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