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Parahydrogen‐Induced Radio Amplification by Stimulated Emission of Radiation
Author(s) -
Joalland Baptiste,
Ariyasingha Nuwandi M.,
Lehmkuhl Sören,
Theis Thomas,
Appelt Stephan,
Chekmenev Eduard Y.
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201916597
Subject(s) - spin isomers of hydrogen , spectrometer , spins , magnetic field , radio frequency , nuclear magnetic resonance , chemistry , excitation , physics , optics , hydrogen , condensed matter physics , telecommunications , organic chemistry , quantum mechanics , computer science
Radio amplification by stimulated emission of radiation (RASER) was recently discovered in a low‐field NMR spectrometer incorporating a highly specialized radio‐frequency resonator, where a high degree of proton‐spin polarization was achieved by reversible parahydrogen exchange. RASER activity, which results from the coherent coupling between the nuclear spins and the inductive detector, can overcome the limits of frequency resolution in NMR. Here we show that this phenomenon is not limited to low magnetic fields or the use of resonators with high‐quality factors. We use a commercial bench‐top 1.4 T NMR spectrometer in conjunction with pairwise parahydrogen addition producing proton‐hyperpolarized molecules in the Earth's magnetic field (ALTADENA condition) or in a high magnetic field (PASADENA condition) to induce RASER without any radio‐frequency excitation pulses. The results demonstrate that RASER activity can be observed on virtually any NMR spectrometer and measures most of the important NMR parameters with high precision.