Proton‐enhanced NMR of dilute spins in solids

Autor:	M. G. Gibby, Alexander Pines, John S. Waugh
Rok vydání:	1973
Předmět:	Spins Proton Chemistry Analytical chemistry General Physics and Astronomy Physical and Theoretical Chemistry Solid material Polarization (waves) Molecular physics
Zdroj:	The Journal of Chemical Physics. 59:569-590
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.1680061
Popis:	The NMR signals of isotopically or chemically dilute nuclear spins S in solids can be enhanced by repeatedly transferring polarization from a more abundant species I of high abundance (usually protons) to which they are coupled. The gain in power sensitivity as compared with conventional observation of the rare spins approaches NII(I+1)γI2/NSS(S+1)γS2, or ∼ 103 for S = 13C, I = 1H in organic solids. The transfer of polarization is accomplished by any of a number of double resonance methods. High‐frequency resolution of the S ‐spin signal is obtained by decoupling of the abundant spins. The experimental requirements of the technique are discussed and a brief comparison of its sensitivity with other procedures is made. Representative applications and experimental results are mentioned.
Databáze:	OpenAIRE
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