Chemistry in Action: Making Molecular Movies with Ultrafast Electron Diffraction and Data Science

1. Auflage 2020
ISBN: 978-3-030-54850-6
Verlag: Springer International Publishing

Buch, Englisch, 239 Seiten, Format (B × H): 160 mm x 241 mm, Gewicht: 559 g

Reihe: Springer Theses

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 ofpotential 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.

Zielgruppe

Research

Autoren/Hrsg.

Liu, Lai Chung

Fachgebiete

• Naturwissenschaften Physik Thermodynamik Festkörperphysik, Kondensierte Materie
• Naturwissenschaften Physik Quantenphysik Atom- und Molekülphysik
• Naturwissenschaften Chemie Analytische Chemie
• Naturwissenschaften Chemie Physikalische Chemie Quantenchemie, Theoretische Chemie

Inhaltsverzeichnis

Chapter1: Introduction.- Chapter2: Methods: Experimental Techniques and Data Science.- Chapter3: Ultrafast Structural Dynamics of (EDO-TTF)2X.- Chapter4: Photocyclization Dynamics of Diarylethene.- Chapter5: Photoinduced Spin Crossover in Iron(II) Systems.- Chapter6: Future Work.- Chapter7: Conclusion.

Über Autor(innen)

Dr. Lai Chung Liu received his PhD from the University of Toronto in 2019.