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Design And Construction Of A High Current Femtosecond Gas Phase Electron Diffraction Setup
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Book Synopsis Design and Construction of a High-Current Femtosecond Gas-Phase Electron Diffraction Setup by : Omid Zandi
Download or read book Design and Construction of a High-Current Femtosecond Gas-Phase Electron Diffraction Setup written by Omid Zandi and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: We designed and constructed a state-of-the-art high current ultrafast gas electron diffraction experimental setup, which resolved two main challenges that constraint temporal resolution in previous setups. These aforementioned bottlenecks were: the space charge effect due to the Coulomb expansion, and the velocity mismatch between the sub-relativistic electrons (probe) and the exciting laser pulse (pump). In our setup, the problem of space charge effect was ameliorated by compressing 90 keV photo-emitted electron pulses using a radio-frequency electric field. The compression allowed us to increase the beam current by almost two orders of magnitude higher than previously reported. We developed a laser-activated streak camera with a streak velocity of 1.89 mrad/ps to evaluate the compression by measuring the electron pulse duration in situ with a resolution of 100 fs. Electron pulses composed of half a million electrons with a duration of 350 fs were obtained. The velocity mismatch problem, on the other hand, was resolved by employing the technique of laser intensity front tilting. We also constructed a setup to measure the duration of the tilted front laser pulses by an interferometric technique. The timing between the pump and the probe was determined either by photo-ionization induced lensing of the electrons in the gas for normal front laser pulses, or by a transient space charge/surface polarization creation in a copper foil that deflected the electron pulses. The change in the timing between the laser and the electrons was measured by the streak camera with a resolution of 70 fs RMS.
Author :Bradley John Siwick Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 :9780612918153 Total Pages :204 pages Book Rating :4.9/5 (181 download)
Book Synopsis Femtosecond Electron Diffraction Studies of Strongly-driven Structural Phase Transitions [microform] by : Bradley John Siwick
Download or read book Femtosecond Electron Diffraction Studies of Strongly-driven Structural Phase Transitions [microform] written by Bradley John Siwick and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 2004 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: The new technique of femtosecond electron diffraction is developed and applied to the study of an ultrafast structural phase transition. A combination of numerical and analytical modeling is used to obtain a comprehensive understanding of the space-charge dominated propagation dynamics of high number density femtosecond electron pulses and to design a novel photoactivated electron gun. This electron source, capable of producing sub-500 femtosecond electron pulses with sufficient brightness to allow the study of even irreversible structural dynamics, is employed to investigate the strongly driven, laser-induced solid-to-liquid phase transition in polycrystalline aluminum. We are able to see, in real time, the loss of the long-range order present in the crystalline phase and the emergence of the liquid structure where only short-range atomic correlations are present; this transition occurs in 3.5 ps for thin-film aluminum with an excitation fluence of 70 mJ/cm2. The sensitivity and temporal resolution was sufficient to capture the time-dependent atomic pair correlation function as the material evolved from the solid to liquid state. These observations provide an atomic level description of the melting process in which the dynamics are best understood as a thermal phase transition under strongly driven conditions.
Book Synopsis Gas-Phase Electron Diffraction by : Kendall N. Houk
Download or read book Gas-Phase Electron Diffraction written by Kendall N. Houk and published by Springer. This book was released on 1975-03-21 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gas-Phase Electron Diffraction by : Kendall N. Houk
Download or read book Gas-Phase Electron Diffraction written by Kendall N. Houk and published by Springer. This book was released on 2013-11-20 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis THE DESIGN AND CONSTRUCTION OF AN ELECTRON DIFFRACTION UNIT FOR GASES AND ITS APPLICATION TO ARGON. by : LAWRENCE SIMS BARTELL
Download or read book THE DESIGN AND CONSTRUCTION OF AN ELECTRON DIFFRACTION UNIT FOR GASES AND ITS APPLICATION TO ARGON. written by LAWRENCE SIMS BARTELL and published by . This book was released on 1951 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Construction of an Electron Diffraction Camera by : James Harvey Hensley
Download or read book Design and Construction of an Electron Diffraction Camera written by James Harvey Hensley and published by . This book was released on 1967 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stereochemical Applications of Gas-phase Electron Diffraction: The electron diffraction technique by : István Hargittai
Download or read book Stereochemical Applications of Gas-phase Electron Diffraction: The electron diffraction technique written by István Hargittai and published by Wiley-VCH. This book was released on 1988 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas-phase electron diffraction is a "direct" physical method for stereochemical analysis. Its main application is the determination of molecular geometry. This book presents this technique to the nonspecialist. Some topics covered in pt. A: status of electron scattering theory with respect to accuracy in structure analyses, small-angle electron scattering by gas molecules, information on electron density distribution from high-energy electron scattering, temperature dependence of electron diffraction structural parameters, joint use of electron diffraction and high-resolution spectroscopic data for accurate determination of molecular structure. Pts. AandB together: $180.00. Annotation copyrighted by Book News, Inc., Portland, OR
Book Synopsis The Design and Construction of an Electron Diffraction Camera by : Richard G. Stoudenheimer
Download or read book The Design and Construction of an Electron Diffraction Camera written by Richard G. Stoudenheimer and published by . This book was released on 1942 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Construction of an Improved Electron Diffraction Camera by : Harold S. Story
Download or read book Design and Construction of an Improved Electron Diffraction Camera written by Harold S. Story and published by . This book was released on 1952 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ultrafast Gas-phase Electron Diffraction by : J. Charles Williamson
Download or read book Ultrafast Gas-phase Electron Diffraction written by J. Charles Williamson and published by . This book was released on 1998 with total page 1478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Design and Construction of an Electron Diffraction System by : Robert M. Mattern
Download or read book The Design and Construction of an Electron Diffraction System written by Robert M. Mattern and published by . This book was released on 1969 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Construction of an Electron Diffraction Apparatus by : Leo Broussard
Download or read book Design and Construction of an Electron Diffraction Apparatus written by Leo Broussard and published by . This book was released on 1939 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Structure Studies written by and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Construction of an electron-diffraction apparatus of unique design, employing electron-counting techniques, was undertaken. The apparatus is to be competitive with photographic diffraction units in terms of sample required, and it is hoped that it will be superior in versatility and in freedom from a number of sources of uncertainty. During the contract period the instrument chamber, vacuum system, counting electronics and logic, electron optics, and detection system were designed. Construction was completed on all but the detection system and final details of a mechanical drive. Work on this apparatus is to continue under sponsorship by the National Science Foundntion. (auth).
Book Synopsis Design and Construction of Apparatus for an Advance Undergraduate Electron Diffraction Experiment by : James R. Herrington
Download or read book Design and Construction of Apparatus for an Advance Undergraduate Electron Diffraction Experiment written by James R. Herrington and published by . This book was released on 1960 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gas Electron Diffraction by : Norwegian Gas Electron Diffraction Group (Oslo)
Download or read book Gas Electron Diffraction written by Norwegian Gas Electron Diffraction Group (Oslo) and published by . This book was released on 1985 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electrical & Electronics Abstracts by :
Download or read book Electrical & Electronics Abstracts written by and published by . This book was released on 1997 with total page 1904 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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