title: Strong-field ionization of atoms and molecules with two-color laser pulses
creator: Mi, Yonghao
subject: 530
subject: 530 Physics
description: 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.
date: 2017
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/23204/1/Thesis_YonghaoMi.pdf
identifier: DOI:10.11588/heidok.00023204
identifier: urn:nbn:de:bsz:16-heidok-232042
identifier:   Mi, Yonghao  (2017) Strong-field ionization of atoms and molecules with two-color laser pulses.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/23204/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng