Towards Femtosecond Time Resolved Electron Spectroscopy for Chemical Analysis
Author | : Annette Pietzsch |
Publisher | : |
Total Pages | : 89 |
Release | : 2008 |
Genre | : |
ISBN | : 9783899637991 |
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Author | : Annette Pietzsch |
Publisher | : |
Total Pages | : 89 |
Release | : 2008 |
Genre | : |
ISBN | : 9783899637991 |
Author | : Jeffrey A. Cina |
Publisher | : Oxford University Press |
Total Pages | : 148 |
Release | : 2022-03-08 |
Genre | : Science |
ISBN | : 0192677055 |
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 | : Lai Chung Liu |
Publisher | : Springer Nature |
Total Pages | : 249 |
Release | : 2020-09-10 |
Genre | : Science |
ISBN | : 3030548511 |
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 | : Kai Siegbahn |
Publisher | : North-Holland |
Total Pages | : 216 |
Release | : 1970 |
Genre | : Science |
ISBN | : |