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Improvement of the two‐dimensional I NADEQUATE technique by a ‘double selection’ experiment
Author(s) -
Piveteau D.,
Delsuc M. A.,
Guittet E.,
Lallemand J. Y.
Publication year - 1985
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260230216
Subject(s) - chemistry , pulse sequence , spins , pulse (music) , sequence (biology) , sign (mathematics) , dimension (graph theory) , selection (genetic algorithm) , spin (aerodynamics) , selectivity , relaxation (psychology) , phase (matter) , quantum , molecular physics , nuclear magnetic resonance , quantum mechanics , condensed matter physics , physics , thermodynamics , combinatorics , mathematical analysis , artificial intelligence , psychology , social psychology , biochemistry , mathematics , organic chemistry , voltage , computer science , catalysis
The two‐dimensional NMR I NADEQUATE pulse sequence allows unambiguous determination of spin‐spin connectivities, especially for dilute spins such as 13 C, through the double‐quantum transitions of the spin system. A development of the sequence is presented which allows sign‐sensitive detection in the F 1 dimension. The selection is obtained at two distinct stages, creation and observation of the double‐quantum transitions. The originality of the proposed sequence consists in a simultaneous modification of the traditional phase programme and pulse angles. A judicious choice of pulse phases is shown, both theoretically and experimentally, to activate the third pulse; modification of its value can then improve the selectivity of the experiment.