High-Resolution Experiments on Strong-Field Ionization of Atoms and Molecules: Test of Tunneling Theory, the Role of Doubly Excited States, and Channel-Selective Electron Spectra

Front Cover
Springer, Apr 26, 2016 - Science - 151 pages
In this thesis, the ionization of atoms and small molecules in strong laser fields is experimentally studied using a reaction microscope. The population of autoionizing doubly excited states in the laser fields is proven and a possible connection to the well-known dielectronic recombination processes is discussed.
The fundamental process of tunnel ionization in strong laser fields is subject of investigation in a pump-probe experiment with ultrashort laser pulses. A coherent superposition of electronic states in singly charged argon ions is created within the first, and subsequently tunnel-ionized with the second pulse. This gives access to state-selective information about the tunneling process and allows to test common models. Moreover, the ionization of krypton and argon at different wavelengths is studied, from the multiphoton to the tunneling regime. The wavelength-dependent investigations are furthermore extended to molecular hydrogen. In addition to ionization, this system might undergo different dissociative processes. Channel-selective electron momentum distributions are presented and compared to each other.
 

What people are saying - Write a review

We haven't found any reviews in the usual places.

Contents

1 Introduction
1
2 Strong Laser Fields and Ultrashort Laser Pulses
5
3 Ionization in Strong Ultrashort Laser Pulses
29
4 The Reaction Microscope
52
5 Tunnel Ionization from a Coherent Superposition in Ar+
77
6 Population of Doubly Excited States in Strong Laser Pulses
96
7 ChannelSelective Electron Spectra for H2 at Different Wavelengths
123
8 Conclusion and Outlook
139
Appendix A
144
Copyright

Other editions - View all

Common terms and phrases

About the author (2016)


Bibliographic information