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| 001 | 863450 | ||
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| 024 | 7 | _ | |a 10.1016/j.pnmrs.2019.05.003 |2 doi |
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| 100 | 1 | _ | |a Appelt, S. |0 P:(DE-Juel1)133861 |b 0 |e Corresponding author |
| 245 | _ | _ | |a From LASER physics to the para-hydrogen pumped RASER |
| 260 | _ | _ | |a Amsterdam [u.a.] |c 2019 |b Elsevier Science |
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| 520 | _ | _ | |a The properties of the LASER with respect to self-organization are compared with the key features of the p-H2 pumped RASER. According to LASER theory the equations of motion for the LASER can be derived from the enslaving principle, i.e. the slowest-changing order parameter (the light field in the resonator) enslaves the rapidly relaxing atomic degrees of freedom. Likewise, it is shown here that the equations of motion for the p-H2 pumped RASER result from a set of order parameters, where the transverse magnetization of the RASER-active spin states enslaves the electromagnetic modes. The consequences are striking for nuclear magnetic resonance (NMR) spectroscopy, since long-lasting multi-mode RASER oscillations enable unprecedented spectroscopic resolution down to the micro-Hertz regime. Based on the theory for multi-mode RASER operation we analyze the conditions that reveal either the collapse of the entire NMR spectrum, the occurrence of self-organized frequency-combs, or RASER spectra which reflect the J-coupled network of the molecule. Certain RASER experiments involving the protons of 15N pyridine or 3-picoline molecules pumped with p-H2 via SABRE (Signal Amplification By Reversible Exchange) show either a single RASER oscillation in the time domain, giant RASER pulses or a complex RASER beat pattern. The corresponding 1H spectra consist of one narrow line, equidistant narrow lines (frequency-comb), or highly resolved lines reporting NMR properties, respectively. Numerous applications in the areas of material sciences, fundamental physics and medicine involving high precision sensors for magnetic fields, rotational motions or molecular structures become feasible. |
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| 700 | 1 | _ | |a Kentner, A. |0 P:(DE-HGF)0 |b 1 |
| 700 | 1 | _ | |a Lehmkuhl, S. |0 P:(DE-HGF)0 |b 2 |
| 700 | 1 | _ | |a Blümich, B. |0 P:(DE-HGF)0 |b 3 |
| 773 | _ | _ | |a 10.1016/j.pnmrs.2019.05.003 |g Vol. 114-115, p. 1 - 32 |0 PERI:(DE-600)1500674-8 |p 1 - 32 |t Progress in nuclear magnetic resonance spectroscopy |v 114-115 |y 2019 |x 0079-6565 |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/863450/files/RASER_LASER_PNMRS_2019.pdf |y Restricted |
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