Matthias Bechmann, Norbert Müller,
"Nonlinear Effects in NMR"
, in Graham A. Webb: Annual Reports on NMR Spectroscopy, Volume 92, Serie Annual Reports on NMR Spectroscopy, Vol. 92, Academic Press ? An imprint of Elsevier, London, Seite(n) 200-227, 8-2017, ISBN: 978-0-12-812084-2
Original Titel:
Nonlinear Effects in NMR
Sprache des Titels:
Englisch
Original Buchtitel:
Annual Reports on NMR Spectroscopy, Volume 92
Original Kurzfassung:
Analytical applications of NMR exploit the widely assumed linearity of the NMR response
with respect to the spin concentration. Deviations of this linearity are undesired and in
this review some current approaches to tackle this problem are given. However, from a
physics point of view, the nonlinearity is a more complex affair. Indeed, NMR as a primary
representative of coherent spectroscopy can be viewed as an inherently nonlinear
method, in particular with respect to the excitation amplitude. Even excluding this
intrinsic property, amplitude response is not always found to be linear and several distinct
fundamental nonlinearity or nonadditivity effects can be caused by spin interactions,
which can either be internal to the specimen, or owed to feedback from the
observation electronics as summarized here with references to the latest literature. Ways
to avoid nonlinear response for quantitative NMR applications are summarized briefly.
Forschungs-