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

  • LutzĀ Fechner

Part of the Springer Theses book series (Springer Theses)

Table of contents

  1. Front Matter
    Pages i-xiv
  2. Lutz Fechner
    Pages 1-4
  3. Lutz Fechner
    Pages 53-75
  4. Lutz Fechner
    Pages 139-143
  5. Back Matter
    Pages 145-151

About this book


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.


Strong Field Physics Reaction Microscope Coltrims Strong Field Ionization Tunnel Ionization Photoelectron Momentum Distributions Doubly Excited States Strong laser pulses

Authors and affiliations

  • LutzĀ Fechner
    • 1
  1. 1.Dept of Quantum Dynamics and ControlMax Planck Institute for Nuclear PhysicsHeidelbergGermany

Bibliographic information