Ultrafast Electronic And Structural Dynamics
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Ultrafast Electronic And Structural Dynamics
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Author : Kiyoshi Ueda
language : en
Publisher: Springer
Release Date : 2024-08-12
Ultrafast Electronic And Structural Dynamics written by Kiyoshi Ueda and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-08-12 with Science categories.
This book illustrates advanced technologies for imaging electrons and atoms in action in various forms of matter, from atoms and diatoms to protein molecules and condensed matter. The technologies that are described employ ultrafast pulsed lasers, X-ray free electron lasers, and pulsed electron guns, with pulse durations from femtoseconds, suitable to visualize atoms in action, to attoseconds, needed to visualize ballistic electron motion. Advanced theories, indispensable for understanding such ultrafast imaging and spectroscopy data on electrons and atoms in action, are also described. The book consists of three parts. The first part describes probing methods of attosecond electron dynamics in atoms, molecules, liquids, and solids. The second part describes femtosecond structural dynamics and coupling of structural change and electron motion in molecules and solids The last part is dedicated to ultrafast photophysical processes and chemical reactions of protein molecules responsible for biological functions.
Ultrafast Electronic And Structural Dynamics In Solids
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Author : Eli Nathan Glezer
language : en
Publisher:
Release Date : 1996
Ultrafast Electronic And Structural Dynamics In Solids written by Eli Nathan Glezer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Laser pulses, Ultrashort categories.
Ultrafast Electronic And Structural Dynamics In Solids Using Femtosecond Laser Techniques
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Author : Jincheng Wang
language : en
Publisher:
Release Date : 2008
Ultrafast Electronic And Structural Dynamics In Solids Using Femtosecond Laser Techniques written by Jincheng Wang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Ultrafast Investigation Of Electronic And Structural Dynamics In Photomagnetic Molecular Solids
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Author : Andrea Marino
language : en
Publisher:
Release Date : 2015
Ultrafast Investigation Of Electronic And Structural Dynamics In Photomagnetic Molecular Solids written by Andrea Marino and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
The ability to photo-switch physical/chemical properties of functional materials through photo induced phase transition opens fascinating perspectives for driving the material towards new state out of thermal equilibrium. However, it is fundamental to disentangle and understand all the dynamical phenomena, otherwise hidden in statistically averaged macroscopic transformations. Arguably, time-resolved studies are unique approach to access the necessary information on the multiple degrees of freedom and elementary processes involved during the macroscopic switching. As photo-reversible molecular switches, spin crossover (SCO) materials are of particular interest. These photomagnetic and photochromic prototype materials undergo metastable photoinduced phase transition between two states of different spin multiplicity, namely low-spin (LS) and high-spin (HS). In this PhD work it will be presented the ultrafast electronic and structural dynamics of SCO molecular solids emphasizing the importance of using complementary probes sensitive to different degrees of freedom. The photoinduced spin state switching concerns initially only an ultrafast, but localized, molecular response which through strong electron-phonon coupling activates coherent intra-molecular vibrations. An ultrafast energy transfer from the molecule to the lattice, via phonon-phonon coupling, allows an efficient trapping of the system in the new photoinduced state. However in molecular solids, the excess of energy released from the absorber molecule results in a complex multi-scale aspect involving several degrees of freedom at different time scales. In this contest, we investigated the multi-step out-of equilibrium dynamics of a SCO system undergoing symmetry breaking between the HS phase and the intermediate (IP) phase where a long range ordering of HS and LS molecules results in a spin state concentration wave (SSCW), analogous to charge or spin density waves. Combined time-resolved X-ray diffraction and optical spectroscopy studies provide a complete overview of the out-of-equilibrium thermodynamics of the SSCW, investigating how the two order parameters describing the system evolve in time.
Ultrafast Electronic And Structural Dynamics
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Author : Kiyoshi Ueda
language : en
Publisher: Springer Nature
Release Date :
Ultrafast Electronic And Structural Dynamics written by Kiyoshi Ueda and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Structural Dynamics By Ultrafast Electron Crystallography
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Author : Songye Chen
language : en
Publisher:
Release Date : 2007
Structural Dynamics By Ultrafast Electron Crystallography written by Songye Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Electronic dissertations categories.
Electron Lattice Interactions And Ultrafast Structural Dynamics Of Solids
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Author : Lutz Waldecker
language : en
Publisher:
Release Date : 2015
Electron Lattice Interactions And Ultrafast Structural Dynamics Of Solids written by Lutz Waldecker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Ultrafast Carrier And Structural Dynamics In Graphite Detected Via Attosecond Soft X Ray Absorption Spectroscopy
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Author : Nicola Di Palo
language : en
Publisher:
Release Date : 2020
Ultrafast Carrier And Structural Dynamics In Graphite Detected Via Attosecond Soft X Ray Absorption Spectroscopy written by Nicola Di Palo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Understanding most of the physical and chemical phenomena determining the world around us requires the possibility to interrogate their main characters on their natural scale in space and time. The insulating or conductive behavior of matter, its magnetic properties or the nature of chemical bonds are strongly dependent on the nuclear and electronic structure of the atoms, molecules or solids considered. Hence, tools are needed to probe electrons and nuclei directly at the atomic scale with a temporal resolution allowing the observation of electron dynamics (on the attosecond-to-femtosecond timescale) and structural dynamics (on the femtosecond-to-picosecond timescale) in real time.Attosecond science offers unique opportunities to investigate electronic and structural dynamics at the heart of important processes in atomic, molecular and solid-state physics. The generation of attosecond bursts of light, in the form of train of pulses or of isolated pulses, has been achieved on table-top sources by exploiting the high-order harmonic generation (HHG) process. The photons constituting the attosecond emission have energies that range from the extreme ultra-violet (XUV) up to the soft X-ray (SXR) region of the spectrum, allowing to interrogate the electronic structure of the probed material directly at the level of the inner electronic shells. Because of this property of accessing the characteristic electronic structure of the elements constituting the target, XUV and, especially, SXR spectroscopy are considered element-specific techniques. Attosecond pulses have already proven to be able to observe ultrafast phenomena in atoms, molecules or solids previously inaccessible.In this thesis, the application of time-resolved X-ray absorption fine-structure (XAFS) spectroscopy using attosecond SXR pulses to the study of carrier and structural dynamics in graphite is reported. In chapter 1, an introduction to the field of attoscience and the presentation of the state of the art of ultrafast dynamics in graphite are given. The established technique to generate attosecond pulses is described and a review of the most significant application of attosecond pulses to the study of electron dynamics is presented. The electronic and structural properties of graphite are then discussed, highlighting some of the most representative experiments detecting electron and lattice dynamics.The experimental setup developed at ICFO in the group of Prof. Dr. Jens Biegert and used for this Ph.D. thesis project is described in details in chapter 2. The system needed for the generation, propagation and detection of the attosecond SXR radiation is presented. The performances of the SXR source in terms of spectral tunability, photon flux and stability are discussed. The implementation of a IR pump - SXR probe scheme is reported, allowing beams' recombination in both collinear and non-collinear fashion. To conclude, the results of an attosecond streaking experiment are presented, through which a temporal characterization of the HHG emission has been achieved.A discussion on the spectroscopic capabilities of XAFS technique to interrogate the electronic and lattice structure of the observed material is presented in chapter 3. The potential of this technique has been demonstrated with an experimental investigation of a graphite thin film, with the results showing the possibility to probe the first unoccupied electronic bands and the characteristic distances defining the lattice structure.Finally, the XAFS capabilities have been exploited in a time-resolved experimental study of graphite to observe light-induced carrier and lattice dynamics, presented in chapter 4. The interpretation of the experimental data reveals insights on the ultrafast interaction of the pump laser field with charge carriers and on the effects of carrier-carrier and carrier-phonon scattering following photoexcitation.
Structural Dynamics Of The Metal Insulator Transition In Vo2
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Author : Vance Morrison
language : en
Publisher:
Release Date : 2014
Structural Dynamics Of The Metal Insulator Transition In Vo2 written by Vance Morrison and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
"In this thesis the design and implementation of an ultrafast electron diffractometer with radio frequency compression capabilities is presented. In addition, the results of ultrafast electron diffraction (UED) measurements on the semiconductor to metal phase transition in vanadium dioxide are shown. The ability to perform UED measurements on ultrafast time scales is first demonstrated by observing the expansion and coherent oscillation of the crystal lattice in thin film, single crystal gold. The evolution of the spatio-temporal charge density in ultrashort pulses was then studied using electron-laser cross correlation measurements mediated by the ponderomotive force. These measurements were compared with particle tracing simulations and theoretical models. Similar electron-laser cross correlation measurements were also performed in order to characterize the behaviour of a novel radio-frequency (RF) pulse compression technique. Using an RF cavity, an oscillating, 3 GHz electric field is synchronized to the electron pulse arrival time and allows for the compression of high bunch charge electron pulses (0.1 pC) to 334+/-10 fs. This represents a bunch charge increase of 10^2-10^3 over previous ultrafast electron sources that provide a sub 500 fs impulse response. Finally, the semiconductor to metal transition in vanadium dioxide was studied using RF compressed electron pulses. Here, distinct ultrafast structural and electronic phase transitions were observed providing insight into the long standing debate surrounding the roles of electron-electron interactions and electron-lattice interactions in this phase transition." --
Electronic Structure And Ultrafast Dynamics In Molecular Systems With X Ray Spectroscopy
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Author :
language : en
Publisher:
Release Date : 2013
Electronic Structure And Ultrafast Dynamics In Molecular Systems With X Ray Spectroscopy written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.