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| Hauptseite > Workflowsammlungen > Publikationsgebühren > Para-hydrogen raser delivers sub-millihertz resolution in nuclear magnetic resonance > print |
| Hauptseite > Workflowsammlungen > Publikationsgebühren > Para-hydrogen raser delivers sub-millihertz resolution in nuclear magnetic resonance > print |
| 001 | 828746 | ||
| 005 | 20250129092408.0 | ||
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| 100 | 1 | _ | |a Süfke, Martin |0 P:(DE-Juel1)162111 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Para-hydrogen raser delivers sub-millihertz resolution in nuclear magnetic resonance |
| 260 | _ | _ | |a Basingstoke |c 2017 |b Nature Publishing Group |
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| 520 | _ | _ | |a 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. |
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| 773 | _ | _ | |a 10.1038/nphys4076 |0 PERI:(DE-600)2206346-8 |p 568–572 |t Nature physics |v 13 |y 2017 |x 1745-2481 |
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