STMAS probe ～to analyze low-sensitivity half-integer spin nuclei in solid-state high-resolution NMR spectroscopy～

JEOL developed a special probe for realizing STMAS (Satellite Transition Magic Angle Spinning) measurements which give highresolution NMR spectra for half-integer spin nuclei in solids.
STMAS may give much higher spectral sensitivity in comparison with MQMAS (Multiple Quantum Magic Angle Spinning).

Comparison of sensitivity in STMAS and MQMAS
Spectrometer: JNM-ECA700, Probe: 3.2mm STMAS
Sample: Kaolin (Cq = 3.5±0.4 MHz) and glass (Cq = 6.8±0.6 MHz)
Spectral sensitivity is compared for various RF field strengths and pulse sequences: Z－filter 3QMAS (+), 3QMAS－SPAM (■), DQ-STMAS (△), DQF-STMAS (○), and DQF-STMAS-SPAM (●).

Five distinct features of STMAS probe

JEOL STMAS has special mechanism for accurate magic angle adjustment within 0.001 degree and its long-term retention, required in STMAS measurements.
STMAS probe, by combining with MAS Controller, allows measurements for low-sensitivity samples and great reduction of measurement time.

JEOL STMAS probe was developed in collaboration with Dr. K. Kanehashi and Dr. T. Takahashi of Nippon Steel Corporation.

Reference

T. Takahashi, K. Kanehashi, Y. Shimoikeda, T. Nemoto and K. Saito, J. Magn. Reson. 198, 228(2009)