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@ARTICLE{Sfke:828746,
author = {Süfke, Martin and Lehmkuhl, Sören and Liebisch, Alexander
and Blümich, Bernhard and Appelt, Stephan},
title = {{P}ara-hydrogen raser delivers sub-millihertz resolution in
nuclear magnetic resonance},
journal = {Nature physics},
volume = {13},
issn = {1745-2481},
address = {Basingstoke},
publisher = {Nature Publishing Group},
reportid = {FZJ-2017-02612},
pages = {568–572},
year = {2017},
abstract = {The precision of nuclear magnetic resonance spectroscopy1
(NMR) is limited by the signal-to-noise ratio, the
measurement time Tm and the linewidth Δν = 1/(πT2).
Overcoming the T 2 limit is possible if the nuclear spins of
a molecule emit continuous radio waves. Lasers and masers
are self-organized systems which emit coherent radiation in
the optical and micro-wave regime. Both are based on
creating a population inversion of specific energy states.
Here we show continuous oscillations of proton spins of
organic molecules in the radiofrequency regime (raser5). We
achieve this by coupling a population inversion created
through signal amplification by reversible exchange (SABRE)
to a high-quality-factor resonator. For the case of 15N
labelled molecules, we observe multi-mode raser activity,
which reports different spin quantum states. The
corresponding 1H-15N J-coupled NMR spectra exhibit
unprecedented sub-millihertz resolution and can be explained
assuming two-spin ordered quantum states. Our findings
demonstrate a substantial improvement in the frequency
resolution of NMR.},
cin = {ZEA-2 / IEK-9},
ddc = {530},
cid = {I:(DE-Juel1)ZEA-2-20090406 / I:(DE-Juel1)IEK-9-20110218},
pnm = {131 - Electrochemical Storage (POF3-131) / HITEC -
Helmholtz Interdisciplinary Doctoral Training in Energy and
Climate Research (HITEC) (HITEC-20170406)},
pid = {G:(DE-HGF)POF3-131 / G:(DE-Juel1)HITEC-20170406},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000402604200017},
doi = {10.1038/nphys4076},
url = {https://juser.fz-juelich.de/record/828746},
}