Molecular properties determined from the relaxation of long-lived spin states. Ahuja, P., Sarkar, R., Vasos, P. R, & Bodenhausen, G. The Journal of chemical physics, 127(13):134112, October, 2007.
Molecular properties determined from the relaxation of long-lived spin states. [link]Paper  doi  abstract   bibtex   
The populations of long-lived spin states, in particular, populations of singlet states that are comprised of antisymmetric combinations of product states, \textbaralpha(I)beta(S)\textgreater- \textbarbeta(I)alpha(S)\textgreater, are characterized by very long lifetimes because the dipole-dipole interaction between the two "active" spins I and S that are involved in such states is inoperative as a relaxation mechanism. The relaxation rate constants of long-lived (singlet) states are therefore determined by the chemical shift anisotropy (CSA) of the active spins and by dipole-dipole interactions with passive spins. For a pair of coupled spins, the singlet-state relaxation rate constants strongly depend on the magnitudes and orientations of the CSA tensors. The relaxation properties of long-lived states therefore reveal new information about molecular symmetry and structure and about spectral density functions that characterize the dynamic behavior.
@article{Ahuja2007,
	title = {Molecular properties determined from the relaxation of long-lived spin states.},
	volume = {127},
	issn = {0021-9606},
	url = {http://scitation.aip.org/content/aip/journal/jcp/127/13/10.1063/1.2778429},
	doi = {10.1063/1.2778429},
	abstract = {The populations of long-lived spin states, in particular, populations of singlet states that are comprised of antisymmetric combinations of product states, {\textbar}alpha(I)beta(S){\textgreater}- {\textbar}beta(I)alpha(S){\textgreater}, are characterized by very long lifetimes because the dipole-dipole interaction between the two "active" spins I and S that are involved in such states is inoperative as a relaxation mechanism. The relaxation rate constants of long-lived (singlet) states are therefore determined by the chemical shift anisotropy (CSA) of the active spins and by dipole-dipole interactions with passive spins. For a pair of coupled spins, the singlet-state relaxation rate constants strongly depend on the magnitudes and orientations of the CSA tensors. The relaxation properties of long-lived states therefore reveal new information about molecular symmetry and structure and about spectral density functions that characterize the dynamic behavior.},
	number = {13},
	journal = {The Journal of chemical physics},
	author = {Ahuja, Puneet and Sarkar, Riddhiman and Vasos, Paul R and Bodenhausen, Geoffrey},
	month = oct,
	year = {2007},
	pmid = {17919016},
	pages = {134112},
}

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