Long-lived heteronuclear spin-singlet states

We report observation of long-lived spin-singlet states in a 13C-1H spin pair at zero magnetic field. In 13C-labeled formic acid, we observe spin-singlet lifetimes as long as 37 seconds, about a factor of three longer than the T1 lifetime of dipole polarization in the triplet state. We also observe...

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Bibliographic Details
Main Authors Emondts, Meike, Ledbetter, Micah. P, Pustelny, Szymon, Theis, Thomas, Patton, Brian, Blanchard, John W, Butler, Mark C, Budker, Dmitry, Pines, Alexander
Format Journal Article
LanguageEnglish
Published 04.10.2013
Subjects
Physics - Chemical Physics
Physics - Mesoscale and Nanoscale Physics
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Summary:We report observation of long-lived spin-singlet states in a 13C-1H spin pair at zero magnetic field. In 13C-labeled formic acid, we observe spin-singlet lifetimes as long as 37 seconds, about a factor of three longer than the T1 lifetime of dipole polarization in the triplet state. We also observe that the lifetime of the singlet-triplet coherence, T2, is longer than T1. Moreover, we demonstrate that this singlet states formed by spins of a heteronucleus and a 1H nucleus, can exhibit longer lifetimes than the respective triplet states in systems consisting of more than two nuclear spins. Although long-lived homonuclear spin-singlet states have been extensively studied, this is the first experimental observation of analogous spin-singlets consisting of a heteronucleus and a proton.
DOI:10.48550/arxiv.1310.1291