Type
Text
Type
Dissertation
Advisor
Louis F. DiMauro, Adjunct Professor, Department of Physics and Astronomy and Professor, The Ohio State University, Department of Physics | Edward Shuryak, Distinguished Professor, Department of Physics and Astronomy | Thomas C. Weinacht. Associate Professor, Department of Physics and Astronomy | Trevor J. Sears, Professor, Department of Chemistry and Senior Chemist, Brookhaven National Laboratory
Date
2009-12-01
Keywords
Ionization | Photoelectron wave packet | Electromagnetic fields | Wave packets
Department
Department of Physics
Language
en_US
Source
This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree.
Identifier
http://hdl.handle.net/11401/71550
Publisher
The Graduate School, Stony Brook University: Stony Brook, NY.
Format
application/pdf
Abstract
When atoms and molecules are subjected to low frequency laser fields whose electric fields rival the atomic and molecular ones, the liberated photoelectrons can revisit and subsequently rescatter on their parent ions within a fraction of the laser period. In the last few years, using nearinfrared pulses it has been shown that the photoelectron momentum distribution carries the fingerprint of a diffraction pattern from which for molecules it is possible to extract structural information. Given that the maximum kinetic energy of the returning photoelectron wave packet increases with the intensity and the square of the wavelength of the driving field, intense mid-infrared laser pulses should be used instead, since they create wave packets that can have an associated de Broglie wavelength smaller than the ionic size. Coupled with the sub-cycle dynamics of the electron wave packet, this diffraction-based mechanism can form the basis of a molecular camera, capable of “viewing” chemical reactions. As a first step in the development of such a camera, we recorded high resolution momentum distributions for atoms and molecules extracting diffraction patterns for both near-infrared and mid-infrared driving laser iii fields. In addition, a low energy structure present in the photoelectron spectra not predicted by analytical models has been investigated.
Recommended Citation
Blaga, Cosmin Ioan, "Atoms and Molecules in Strong Midinfrared Laser
Fields" (2009). Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions). 755.
https://commons.library.stonybrook.edu/stony-brook-theses-and-dissertations-collection/755