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Titolo:
Intermolecular multiple quantum coherences in liquids
Autore:
Richter, W; Warren, WS;
Indirizzi:
Natl Res Council Canada, Inst Biodiagnost, Winnipeg, MB R3B 1Y6, Canada Natl Res Council Canada Winnipeg MB Canada R3B 1Y6 eg, MB R3B 1Y6, Canada Princeton Univ, Princeton, NJ 08544 USA Princeton Univ Princeton NJ USA 08544 ceton Univ, Princeton, NJ 08544 USA
Titolo Testata:
CONCEPTS IN MAGNETIC RESONANCE
fascicolo: 6, volume: 12, anno: 2000,
pagine: 396 - 409
SICI:
1043-7347(2000)12:6<396:IMQCIL>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUCLEAR-MAGNETIC-RESONANCE; SENSORY STIMULATION; DIPOLAR FIELD; NMR; ECHOES; TERMS;
Keywords:
high-temperature approximation; multiple quantum coherences; dipolar couplings; CRAZED; density matrix;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Richter, W Natl Res Council Canada, Inst Biodiagnost, 435 Ellice Ave, Winnipeg, MB R3B 1Y6, Canada Natl Res Council Canada 435 Ellice Ave Winnipeg MBCanada R3B 1Y6
Citazione:
W. Richter e W.S. Warren, "Intermolecular multiple quantum coherences in liquids", CON MAG RES, 12(6), 2000, pp. 396-409

Abstract

In the early 1990s, the traditional framework of NMR spectroscopy was challenged through a series of simple experiments. The pulse sequences used consisted of a few RF pulses and a few gradient pulses, and the samples were mixtures of simple molecules. The spectra showed unexpected cross peaks between spins in different molecules. In order to explain these results, two basic assumptions had to be revisited: (1) the high-temperature approximationto the Boltzmann distribution at equilibrium, and (2) the cancellation of dipolar couplings in solution. A close look at the physics involved showed that correlations between spins in separate molecules exist even after a single pulse, and that dipolar couplings can make these correlations visible in the presence of gradient pulses. A comprehensive description of the effect is given here, and some present and future applications are discussed. (C) 2000 John Wiley & Sons, Inc.

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Documento generato il 18/01/21 alle ore 16:29:18