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  Femtosecond Electron diffraction Studies of Photoinduced Spin Crossover in Single Crystal [Fe(PM-AzA)2](NCS)2

Jiang, Y. (2016). Femtosecond Electron diffraction Studies of Photoinduced Spin Crossover in Single Crystal [Fe(PM-AzA)2](NCS)2. PhD Thesis, Universität Hamburg, Hamburg.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-DAC1-F Version Permalink: http://hdl.handle.net/21.11116/0000-0001-DB09-F
Genre: Thesis
Other : Femtosekunden-Elektronenbeugung von Photoinduziertem Spin-Crossover im Einkristall [Fe(PM-AzA)2](NCS)2

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Dissertation.pdf (Publisher version), 5MB
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2016
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© Yifeng Jiang
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 Creators:
Jiang, Yifeng1, Author              
Affiliations:
1Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938288              

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Free keywords: Chemie, Spin Crossover, Elektronenbeugung, Radiofrequenz, ultraschnelle, Radio frequence, ultrafast
 Abstract: In this thesis, photoinduced SCO dynamics of single crystal Fe(PM-AzA)2](NCS)2 is studied by DC-RF hybrid femtosecond electron diffraction system (FED). The temporal characteristics of the high brightness electron pulses is characterized by a photo-triggered streak camera. The results of the FED experiment show that the structural changes of the metal and ligand and electronic state changes in the metal atom are concomitant but not simultaneous. The metal-ligand bond elongation, compared to other nuclear motions in the photoinduced SCO, is not a conclusive signature of the photoinduced SCO, and it is coupled to the other nuclear motions in phase transition. The metal-ligand bond elongation (and other nuclear motions) is significantly delayed with respect to the electronic SCO transitions.
 Abstract: In dieser Arbeit wird photoinduzierte SCO-Dynamik von Monokristall Fe(PM-AzA)2](NCS)2) durch die DC-RF-Hybrid-FED untersucht . Die zeitlichen Eigenschaften der Elektronenpulse mit hohen Helligkeit wird von einem photoinduzierten Streak-Kamera gemessen. Die Ergebnisse des FED-Experiments zeigen, dass die Strukturänderungen des Metalls und Ligands und die elektronische Zustandsänderungen in dem Metallatom sind begleitend, aber nicht gleichzeitig. Die Dehnung einer Metall-Ligand-Bindung, im Vergleich zu anderen Kernbewegungen in der photoinduzierten SCO, ist kein ausschlaggebender Faktor des photoinduziertes SCO. Sie wird mit den anderen Kernbewegungen in Phasenübergang kombiniert. Die Dehnung einer Metall-Ligand-Bindung (und andere Kernbewegungen) ist, im Vergleich zu SCO-Dynamiken, signifikant verzögert.

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Language(s): eng - English
 Dates: 2016-12-012016
 Publication Status: Published in print
 Pages: 130
 Publishing info: Hamburg : Universität Hamburg
 Table of Contents: -
 Rev. Type: -
 Identifiers: URN: urn:nbn:de:gbv:18-82223
 Degree: PhD

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