Composite pulses in directly and indirectly detected 14N MAS overtone spectroscopy

Ming Shen; Qun Chen; Bingwen Hu

doi:10.1016/j.ssnmr.2017.01.007

Composite pulses in directly and indirectly detected ¹⁴N MAS overtone spectroscopy

Solid State Nucl Magn Reson. 2017 Jul-Aug:84:132-136. doi: 10.1016/j.ssnmr.2017.01.007. Epub 2017 Feb 3.

Authors

Ming Shen¹, Qun Chen¹, Bingwen Hu²

Affiliations

¹ School of Physics and Materials Science, Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China.
² School of Physics and Materials Science, Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China. Electronic address: bwhu@phy.ecnu.edu.cn.

PMID: 28169117
DOI: 10.1016/j.ssnmr.2017.01.007

Abstract

¹⁴N MAS overtone spectroscopy is mainly limited by narrow excitation bandwidths owing to the use of very long pulses to get stronger signals. We previously reported the use of modified 90° composite pulses for broadband excitation in ¹H-{NOTDQ14}D-HMQC experiments at ultra-fast MAS. In this work, we modified the 180° composite pulses, which are originally designed for spin 1/2 nuclei, for both indirect detection in ¹H-{NOTDQ14}D-HMQC experiment and direct detection in one-pulse experiment, and found that the modified 180° composite pulses are useful for broadband excitation. Furthermore, we found that the bandwidth can be tailored by simply adjusting the total pulse length.

Keywords: (14)N overtone spectroscopy; D-HMQC; Ultra-fast MAS.

Publication types

Research Support, Non-U.S. Gov't