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The Steady‐State ALTADENA RASER generates Continuous NMR Signals

Yang, Jing 1; Wang, Peng 1; Korvink, Jan G. 1; Brandner, Jürgen J. 1; Lehmkuhl, Sören ORCID iD icon 1
1 Institut für Mikrostrukturtechnik (IMT), Karlsruher Institut für Technologie (KIT)

Abstract:

A RASER (Radio Amplification by Stimulated Emission of Radiation) facilitates the study of nonlinear phenomena, as well as the determination of NMR parameters with high precision. To achieve maximum sensitivity in the desired operating mode, it is crucial to control the RASER over long periods of time. So far, this was only possible at ultra-low magnetic fields. Here, we introduce a way to control the operating regime of a RASER at a magnetic field of 1.45 T. We employ a continuous-flow RASER, pumped by PHIP (ParaHydrogen Induced Polarization). The hydrogenation of vinyl acetate (VA) with parahydrogen provides the required negative polarization on the methyl group of the product ethyl acetate (EA). The protons within the methyl group, separated by a 7 Hz J-coupling, are RASER active. This system demonstrates five RASER phenomena: inequivalent and equivalent amplitudes in the “normal NMR mode”, period doublings, frequency combs, and chaos. The experiments match with simulations based on a theoretical model of two nonlinear-coupled RASER modes. We predict the RASER regime at set conditions and visualize the prediction in a bifurcation diagram.


Verlagsausgabe §
DOI: 10.5445/IR/1000158890
Veröffentlicht am 02.01.2024
Originalveröffentlichung
DOI: 10.1002/cphc.202300204
Scopus
Zitationen: 4
Web of Science
Zitationen: 3
Dimensions
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2023
Sprache Englisch
Identifikator ISSN: 1439-4235, 1439-7641
KITopen-ID: 1000158890
HGF-Programm 43.35.01 (POF IV, LK 01) Platform for Correlative, In Situ & Operando Charakterizat.
Erschienen in ChemPhysChem
Verlag John Wiley and Sons
Band 24
Heft 14
Seiten Art.Nr.: e202300204
Vorab online veröffentlicht am 14.05.2023
Schlagwörter hyperpolarization, NMR spectroscopy, nonlinear dynamics, parahydrogen, RASER
Nachgewiesen in Scopus
Dimensions
Web of Science
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