By Lutz Fechner
In this thesis, the ionization of atoms and small molecules in robust laser fields is experimentally studied utilizing a response microscope. The inhabitants of autoionizing doubly excited states within the laser fields is confirmed and a potential connection to the well known dielectronic recombination strategies is discussed.
The primary strategy of tunnel ionization in robust laser fields is topic of research in a pump-probe scan with ultrashort laser pulses. A coherent superposition of digital states in singly charged argon ions is created in the first, and accordingly tunnel-ionized with the second one pulse. this provides entry to state-selective information regarding the tunneling strategy and permits to check universal types. furthermore, the ionization of krypton and argon at assorted wavelengths is studied, from the multiphoton to the tunneling regime. The wavelength-dependent investigations are additionally prolonged to molecular hydrogen. as well as ionization, the program may well endure various dissociative methods. Channel-selective electron momentum distributions are provided and in comparison to each one other.
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Additional info for 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
571743 21. Fritz Kurt Kneubühl and Markus Werner Sigrist. Laser. Vierweg + Teubner (2008) 22. F. Krausz et al. ), Ultrafast Optics IV (Springer, LLC, New York, 2004) 23. M. D. thesis. Ruperto-Carola University of Heidelberg, Germany. URN: urn:nbn:de:bsz:16-heidok-100544 (2009) 24. A. Krupp, Untersuchung der Pulsdauer und Langzeitstabilisierung eines Hohlfaserkompressors, BA thesis. Ruperto-Carola University of Heidelberg, Germany (2011) 25. M. , Sub-20-fs, kilohertz-repetition-rate Ti:sapphire amplifier.
9) for ionization of argon with 790 nm radiation and an intensity of 3 × 1014 W/cm2 . Intracycle interference of five periods in the laser field is considered. b Same as for (a) but neglected intercycle interference effects. c Same as (a) but with a simple intensity averaging, see text for more details. The linear color scale used is displayed in Fig. 4 The Role of Excited States Although the equations presented in the last sections are commonly used and often yield satisfactory results, they in fact mostly disregard the inner structure of the atoms in terms of excited states.
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