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Abstract
In this work the laser-induced ionization of atoms and simple molecules is experimentally investigated by using a Reaction Microscope and sculpted laser pulses. The Reaction Microscope allows to distinguish different ionization channels with the ion-electron coincidence technique. The sculpted laser pulses, which are realized by superposition of two laser pulses with different colors and adjustable relative phase, play a key role in controlling the electronic wavepacket with high temporal resolution.
With these two methods, phase-controllable strong-field ionization of Ar and N2 is studied and electrons emitted from single ionization of Ar and N2 are compared. Moreover, channel-selective electron emission is investigated for the fundamental molecular case of H2. A significant difference in the low-energy photoelectron yield between bound and dissociative ionization channel is observed, proving the Born-Oppenheimer-based two-step process is not complete. Finally, this observation is understood as the population and subsequent decay of autoionizing states by further investigations with the two-color laser pulses.
Dokumententyp: | Dissertation |
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Erstgutachter: | Pfeifer, Prof. Dr. Thomas |
Ort der Veröffentlichung: | Heidelberg, Germamy |
Tag der Prüfung: | 28 Juni 2017 |
Erstellungsdatum: | 07 Jul. 2017 07:39 |
Erscheinungsjahr: | 2017 |
Institute/Einrichtungen: | Fakultät für Physik und Astronomie > Dekanat der Fakultät für Physik und Astronomie |
DDC-Sachgruppe: | 530 Physik |
Normierte Schlagwörter: | Strong-field ionization, atoms and molecules, two-color laser pulses |