Scholarlink

With recent advances in magic angle spinning (MAS) technology, commercially available MAS probes can now achieve MAS rates exceeding 100 kHz. The very fast MAS system is characterized by tiny rotors with a diameter less than 1 mm, a sample volume less than 1 μL, and a strong rf-field strength close to 1 MHz. Due to these extreme features, careful handling of hardware and precise setup of experimental conditions is imperative for very fast MAS measurements. The primary objective of this chapter is to furnish a comprehensive and practical guide for establishing fundamental experimental conditions including both sample-independent and sample-dependent variables, related to very fast MAS techniques. Detailed discussions cover shimming, magic angle adjustment, rf-field strength calibration, frequency referencing, repetition delay, and fluctuations in spinning rate. In addition, the chapter introduces two widely used two-dimensional (2D) measurements: 1H homonuclear double-quantum/single quantum (DQ/SQ) correlations and X/1H cross-polarization heteronuclear single quantum coherence (CP-HSQC) experiments.

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Solid-State NMR Under Ultra-Fast MAS Rate of 40–120 kHz

  • 章节

  • 发表日期：

    2025年

查看全文
  • Yusuke Nishiyama

摘要

With recent advances in magic angle spinning (MAS) technology, commercially available MAS probes can now achieve MAS rates exceeding 100 kHz. The very fast MAS system is characterized by tiny rotors with a diameter less than 1 mm, a sample volume less than 1 μL, and a strong rf-field strength close to 1 MHz. Due to these extreme features, careful handling of hardware and precise setup of experimental conditions is imperative for very fast MAS measurements. The primary objective of this chapter is to furnish a comprehensive and practical guide for establishing fundamental experimental conditions including both sample-independent and sample-dependent variables, related to very fast MAS techniques. Detailed discussions cover shimming, magic angle adjustment, rf-field strength calibration, frequency referencing, repetition delay, and fluctuations in spinning rate. In addition, the chapter introduces two widely used two-dimensional (2D) measurements: 1H homonuclear double-quantum/single quantum (DQ/SQ) correlations and X/1H cross-polarization heteronuclear single quantum coherence (CP-HSQC) experiments.