@article {397,
	title = {Time-reversal of cross-polarization in nuclear magnetic resonance},
	journal = {Journal of Chemical Physics},
	volume = {108},
	year = {1998},
	note = {J Chem Phys108FUTimes Cited:11Cited References Count:17},
	month = {Jun 15},
	pages = {9611-9613},
	abstract = {<p>It is demonstrated that the time evolution of the heteronuclear polarization-transfer process in a dipolar-coupled nuclear spin system can be reversed, leading to the observation of cross polarization echoes. The cross-polarization echoes are induced by consecutive application of two pulse trains that produce effective Hamiltonians that differ only in sign, Cross-polarization echoes have been recorded for a powder sample of alanine. The time evolution of the spin;system is consistent with both unitary quantum dynamics and with spin thermodynamics of two systems approaching a common spin temperature. (C) 1998 American Institute of Physics.</p>
},
	keywords = {echoes},
	isbn = {0021-9606},
	doi = {Doi 10.1063/1.476435},
	url = {<Go to ISI>://WOS:000075256100001},
	author = {Ernst, M. and Meier, B. H. and Tomaselli, M. and Pines, A.}
}
