Time-resolved X-ray Diffraction Studies of Phonons and Phase Transitions PDF Download

Author: Ola Synnergren
Publisher:
ISBN:
Category : Phase transformations (Statistical physics)
Languages : en
Pages : 146

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Author: Henrik Enquist
Publisher:
ISBN: 9789162878689
Category :
Languages : en
Pages :

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Author: Åsa Bengtsson
Publisher:
ISBN: 9789180391849
Category :
Languages : en
Pages : 0

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Book Description
X-ray diffraction is an invaluable tool in the field of structural dynamics. In the work described in this thesis, time-resolved X-ray diffraction experiments were carried out to investigate ultrafast lattice dynamics. Ultrashort laser pulses were used to induce non-thermal melting and large-amplitude strain waves, and X-rays were used to probe these phenomena. Non-thermal melting was studied in indium antimonide (InSb). It was found that the inertial model, which states that the motion of the atoms is determined by their initial vibrational energy at the time of laser irradiation, accurately describes the process of non-thermal melting. It was demonstrated that the model is valid over a large range of temperatures, from 35 to 500 K, when taking the zero-point energy into account at low temperatures. It was also shown how the process of non-thermal melting can be used as a timing monitor to determine the relative timing of laser and X-ray beams in pump/probe experiments. It was shown how the use of an opto-acoustic transducer could reduce the duration of an Xray pulse. The transducer was made of a thin gold film deposited on the surface of bulk InSb. Upon heating the thin gold film with an ultrashort laser pulse, a strain wave was generated in the semiconductor. This resulted in a modulated phonon spectrum and X-ray reflectivity. It was shown that a 100 ps long X-ray pulse can be transformed to a 20 ps pulse with an 8% efficiency. A large-amplitude strain wave was generated in graphite using an ultrashort laser pulse to elucidate the potential role of strain in phase transitions. The temporal evolution of the strain wave was mapped, and the pressure deduced. It was found that it was possible to induce a pressure and temperature corresponding to the region in the carbon phase diagram in which diamond can form.

Author: Paul Corkum
Publisher: Springer Science & Business Media
ISBN: 3540687815
Category : Science
Languages : en
Pages : 853

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Book Description
This book summarizes the results presented at the 15th International Conference on Ultrafast Phenomena and provides an up-to-date view of this important field. It presents the latest advances in ultrafast science, including both ultrafast optical technology and the study of ultrafast phenomena. It covers picosecond, femtosecond, and attosecond processes relevant to applications in physics, chemistry, biology, and engineering.

Author: Kenneth W. Evans-Lutterodt
Publisher:
ISBN:
Category :
Languages : en
Pages : 264

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Author: Theo Woike
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 3110433923
Category : Science
Languages : en
Pages : 282

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Book Description
Volume 1 of this work presents theory and methods to study the structure of condensed matter on different time scales. The authors cover the structure analysis by X-ray diffraction methods from crystalline to amorphous materials, from static-relaxed averaged structures to short-lived electronically excited structures, including detailed descriptions of the time-resolved experimental methods. Complementary, an overview of the theoretical description of condensed matter by static and time-dependent density functional theory is given, starting from the fundamental quantities that can be obtained by these methods through to the recent challenges in the description of time dependent phenomena such as optical excitations. Contents Static structural analysis of condensed matter: from single-crystal to amorphous DFT calculations of solids in the ground state TDDFT, excitations, and spectroscopy Time-resolved structural analysis: probing condensed matter in motion Ultrafast science

Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 44

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Author: Paul Corkum
Publisher: Springer Science & Business Media
ISBN: 3540959467
Category : Science
Languages : en
Pages : 1031

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Book Description
Ultrafast Phenomena XVI presents the latest advances in ultrafast science, including both ultrafast optical technology and the study of ultrafast phenomena. It covers picosecond, femtosecond and attosecond processes relevant to applications in physics, chemistry, biology, and engineering. Ultrafast technology has a profound impact in a wide range of applications, amongst them biomedical imaging, chemical dynamics, frequency standards, material processing, and ultrahigh speed communications. This book summarizes the results presented at the 16th International Conference on Ultrafast Phenomena and provides an up-to-date view of this important and rapidly advancing field.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Bruno Pignataro
Publisher: John Wiley & Sons
ISBN: 9783527630547
Category : Technology & Engineering
Languages : en
Pages : 432

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Book Description
Written by some of the most talented young chemists in Europe, this text covers most of the groundbreaking issues in materials science. It provides an account of the latest research results in European materials chemistry based on a selection of leading young scientists participating in the 2008 European Young Chemists Award competition. The contributions range from nanotechnology to catalysis. In addition, the authors provide a current overview of their field of research and a preview of future directions. For materials scientists, as well as organic and analytical chemists.