Heteronuclear intermolecular single-quantum coherences in liquid nuclear agnetic resonance
Chen Song(陈松)a), Zhu Xiao-Qin(朱小钦)b)a), Cai Shu-Hui(蔡淑惠)a), and Chen Zhong(陈忠)a)†
a Department of Physics, State Key Laboratory of Physical Chemistry of Solid Surface, Xiamen University, Xiamen 361005, China; b School of Physics and Optoelectronics Technology, Key Laboratory of Optoelectronic Science and Technology for Medicine, Ministry of Education, Fujian Normal University, Fuzhou rm 350007, China
Abstract This paper analyses the heteronuclear Cosy Revamped by Asymmetric Z-gradient Echo Detection pulse sequence. General theoretical expressions of the pulse sequence with arbitrary flip angles were derived by using dipolar field treatment and signals originating from heteronuclear intermolecular single-quantum coherences (iSQCs) in highly-polarized two spin-1/2 systems were mainly discussed in order to find the optimal flip angles. The results show that signals from heteronuclear iSQCs decay slower than those from intermolecular double-quantum coherences or intermolecular zero-quantum coherences. Magical angle experiments validate that the signals are from heteronuclear iSQCs and insensitive to the imperfection of radio-frequency flip angles. All experimental observations are in excellent agreement with theoretical predictions. The quantum-mechanical treatment leads to similar predictions to the dipolar field treatment.
Received: 05 June 2007
Revised: 06 July 2007
Accepted manuscript online:
PACS:
76.60.-k
(Nuclear magnetic resonance and relaxation)
Fund: Project supported
by the National Natural Science Foundation of China (Grant Nos
20573084 and 10575085), the Nation Science Foundation of Fujian,
China (Grant No A0610005), and the Program for New Century Excellent
Talents in
University of Ministry of Education of China.
Cite this article:
Chen Song(陈松), Zhu Xiao-Qin(朱小钦), Cai Shu-Hui(蔡淑惠), and Chen Zhong(陈忠) Heteronuclear intermolecular single-quantum coherences in liquid nuclear agnetic resonance 2008 Chin. Phys. B 17 915
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