Journal
JOURNAL OF MAGNETIC RESONANCE
Volume 242, Issue -, Pages 136-142Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2014.02.014
Keywords
NMR; Rabi resonance; Rabi frequency; Continuous wave; Amplitude modulation; Bloch equations
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The response of a magnetic resonance spin system is predicted and experimentally verified for the particular case of a continuous wave amplitude modulated radiofrequency excitation. The experimental results demonstrate phenomena not previously observed in magnetic resonance systems, including a secondary resonance condition when the amplitude of the excitation equals the modulation frequency. This secondary resonance produces a relatively large steady state magnetisation with Fourier components at harmonics of the modulation frequency. Experiments are in excellent agreement with the theoretical prediction derived from the Bloch equations, which provides a sound theoretical framework for future developments in NMR spectroscopy and imaging. (C) 2014 Elsevier Inc. All rights reserved.
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