Towards Femtosecond Time Resolved Electron Spectroscopy for Chemical Analysis PDF Download

Author: Annette Pietzsch
Publisher:
ISBN: 9783899637991
Category :
Languages : en
Pages : 89

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Author: Carolyn Patricia Schick
Publisher:
ISBN:
Category :
Languages : en
Pages : 300

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Author: Lai Chung Liu
Publisher: Springer Nature
ISBN: 3030548511
Category : Science
Languages : en
Pages : 249

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Book Description
The thesis provides the necessary experimental and analytical tools to unambiguously observe the atomically resolved chemical reactions. A great challenge of modern science has been to directly observe atomic motions during structural transitions, and while this was first achieved through a major advance in electron source brightness, the information content was still limited and new methods for image reconstruction using femtosecond electron diffraction methods were needed. One particular challenge lay in reconciling the innumerable possible nuclear configurations with the observation of chemical reaction mechanisms that reproducibly give the same kind of chemistry for large classes of molecules. The author shows that there is a simple solution that occurs during barrier crossing in which the highly anharmonic potential at that point in nuclear rearrangements couples high- and low-frequency vibrational modes to give highly localized nuclear motions, reducing hundreds of potential degrees of freedom to just a few key modes. Specific examples are given in this thesis, including two photoinduced phase transitions in an organic system, a ring closure reaction, and two direct observations of nuclear reorganization driven by spin transitions. The emerging field of structural dynamics promises to change the way we think about the physics of chemistry and this thesis provides tools to make it happen.

Author: Alison Virginia Davis
Publisher:
ISBN:
Category :
Languages : en
Pages : 362

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Author: Peter Šiffalovič
Publisher:
ISBN:
Category :
Languages : de
Pages : 104

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Author: Mark A. Day
Publisher:
ISBN:
Category :
Languages : en
Pages : 446

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Author: Takayuki Ebata
Publisher:
ISBN: 9789811393723
Category : Cold gases
Languages : en
Pages :

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This book describes advanced research on the structures and photochemical properties of polyatomic molecules and molecular clusters having various functionalities under cold gas-phase conditions. Target molecules are crown ethers, polypeptides, large size protonated clusters, metal clusters, and other complex polyatomic molecules of special interest. A variety of advanced frequency and time-domain laser spectroscopic methods are applied. The book begins with the principle of an experimental setup for cold gas-phase molecules and various laser spectroscopic methods, followed by chapters on investigation of specific molecular systems. Through a molecular-level approach and analysis by quantum chemical calculation, it is possible to learn how atomic and molecular-level interactions (van der Waals, hydrogen-bonding, and others) control the specific properties of molecules and clusters. Those properties include molecular recognition, induced fitting, chirality, proton and hydrogen transfer, isomerization, and catalytic reaction. The information will be applicable to the design of new types of functional molecules and nanoparticles in the broad area that includes applied chemistry, drug delivery systems, and catalysts.

Author: 謝承志
Publisher:
ISBN:
Category :
Languages : en
Pages : 209

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Author: Jeffrey A. Cina
Publisher: Oxford University Press
ISBN: 0192677055
Category : Science
Languages : en
Pages : 148

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This textbook provides an overview of the basics of ultrafast molecular spectroscopy starting from time-dependent quantum mechanical perturbation theory in Hilbert space. It emphasizes the dynamics of nuclear and electronic motion, initiated and monitored by femtosecond laser pulses, which underlie the generation of nonlinear optical signals and inform their interpretation. Topics include short-pulse electronic absorption, the molecular adiabatic approximation, transient-absorption spectroscopy, vibrational adiabaticity during conformational change, femtosecond stimulated Raman spectroscopy, multi-dimensional electronic spectroscopy and wave-packet interferometry, and two-dimensional wave-packet interferometry of electronic excitation-transfer systems. The treatment is based on time-dependent quantum mechanics as it is presented in graduate-level quantum mechanics courses. It is designed to be accessible to beginning practitioners of ultrafast spectroscopy and is meant to serve as a bridge to more advanced treatises and research publications. Numerous exercises are embedded in the text to explore and expand upon the physical ideas encountered in this important research field.

Author: Chunhai Fan
Publisher: John Wiley & Sons
ISBN: 352769711X
Category : Technology & Engineering
Languages : en
Pages : 981

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Book Description
Endlich ein Fachbuch mit detaillierten Informationen zu einer der fortschrittlichsten Methoden zur Materialcharakterisierung. Ein herausragendes Team aus Herausgebern und Autoren von renommierten Einrichtungen und Institutionen beschäftigt sich mit Synchrotron-Verfahren, die sich in der Materialforschung bewährt haben. Nach einer Einführung in die Synchrotronstrahlung und ihrer Quellen werden die verschiedenen Techniken beschrieben, die von diesem besonders hellen Licht profitieren, u. a. Röntgenabsorption, Diffraktion, Streuung, Bildgebung und Lithographie. Zum Schluss folgt ein Überblick über die Anwendungen der Synchrotronstrahlung in den Materialwissenschaften. Dieses einzigartige, unabdingbare Referenzwerk für akademische Forscher und Forscher aus der Industrie verbindet Spezialisten aus der Synchrotronforschung und Materialwissenschaftler.