Global ETD Search

1	Electron spin resonance in a 2D system at a GaN/AlGaN heterojunction Shchepetilnikov, A. V., Frolov, D. D., Solovyev, V. V., Nefyodov, Yu. A., Großer, A., Mikolajick, T., Schmult, S., Kukushkin, I. V. 23 June 2022 (has links) Spin resonance of a two-dimensional electron system confined in a GaN/AlGaN heterostructure grown by molecular beam epitaxy was resistively detected over a wide range of magnetic field and microwave frequency. Although the spin-orbit interaction is strong in this type of heterostructure at zero magnetic field, surprisingly the width of the detected spin resonance line was very narrow—down to 6.5 mT at 13.3 T. The spin depolarization time extracted from the resonance linewidth was estimated to be 2 ns. The electron g-factor was measured with high accuracy, resembling a value close to the free-electron value and its dependence on the magnetic field was studied. info:eu-repo/classification/ddc/530 ddc:530
2	Direct observation and characterisation of 3-azido-2H-azirines: postulated, but highly elusive intermediates Weigand, Kevin, Singh, Neeraj, Hagedorn, Manfred, Banert, Klaus 29 March 2017 (has links) (PDF) For the first time, successful synthesis of an unknown class of compounds, 3-azido-2H-azirines, which are implicated as highly reactive intermediates in the thermolysis of the corresponding 1,1-diazidoethenes, has been performed. These elusive heterocycles have been detected and characterised by low-temperature NMR and in situ IR spectroscopy. Even the parent compound, 3-azido-2H-azirine, has been observed via low-temperature photolysis of 1,1-diazidoethene, as a highly reactive species with a half-life period of only 12 min at −40 °C. / Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich. Azide Cycloadditionsreaktionen heterocyclische Verbindungen Infrarot-Spektroskopie Kernmagnetische Resonanzspektroskopie kurzlebige Intermediate Photochemie Ringspannung azides cycloaddition reactions heterocyclic compounds IR spectroscopy NMR spectroscopy photochemistry ring strain short-lived intermediates ddc:547 Azide Heterocyclische Verbindungen Infrarotspektroskopie NMR-Spektroskopie Fotochemie Ringspannung
3	Direct observation and characterisation of 3-azido-2H-azirines: postulated, but highly elusive intermediates Weigand, Kevin, Singh, Neeraj, Hagedorn, Manfred, Banert, Klaus 29 March 2017 (has links) For the first time, successful synthesis of an unknown class of compounds, 3-azido-2H-azirines, which are implicated as highly reactive intermediates in the thermolysis of the corresponding 1,1-diazidoethenes, has been performed. These elusive heterocycles have been detected and characterised by low-temperature NMR and in situ IR spectroscopy. Even the parent compound, 3-azido-2H-azirine, has been observed via low-temperature photolysis of 1,1-diazidoethene, as a highly reactive species with a half-life period of only 12 min at −40 °C. / Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich. info:eu-repo/classification/ddc/547 ddc:547

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