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research article

Curious consequences of strong coupling in NMR experiments involving selective pulses

Huth, Johannes
•
Fu, Riqiang
•
Bodenhausen, Geoffrey  
1996
Journal of Magnetic Resonance, Series A

This study is concerned with the effects of applying selective pulses to systems with strong 2nd-order scalar couplings in isotropic phase, where different transitions (rs) are assocd. with different transition matrix elements F(rs)+. Two unusual features can be distinguished: the nutation angle (flip angle) depends on the matrix element of the irradiated transition (rs), and, in contrast to the behavior of an isolated spin-1/2 system, the norm of the three single-transition operators [Ix(rs), Iy(rs), Iz(rs)] assocd. with the fictitious spin-1/2 space of the irradiated transition (rs) is generally not conserved. It is necessary to consider the single-transition operators [I3x(rp), Iy(rp), Iz(rp)] and [Ix(sq), Iy(sq), Iz(sq)] assocd. with all connected transitions (rp) and (sq) that share a common energy level r or s with the irradiated transition (rs). If the pulse applied to the (rs) transition is sufficiently selective, the transverse components Ix(rp), Iy(rp), Ix(sq), and Iy(sq) can be neglected, since their expectation values remain equal to zero after application of a selective pulse to the (rs) transition, but the longitudinal components Iz(rp) and Iz(sq) acquire nonvanishing expectation values. When the selective pulse affects several transitions simultaneously, the response varies from one transition to another, depending on the matrix elements and the connectivities. These effects manifest themselves in unusual amplitudes and phases of signals excited by selective pulses, in particular in selective two-dimensional correlation spectra. [on SciFinder (R)]

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Type
research article
DOI
10.1006/jmra.1996.0217
Author(s)
Huth, Johannes
Fu, Riqiang
Bodenhausen, Geoffrey  
Date Issued

1996

Published in
Journal of Magnetic Resonance, Series A
Volume

123

Issue

1

Start page

87

End page

94

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LRMB  
Available on Infoscience
February 22, 2006
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/225603
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