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  Momentum Imaging of Photofragments and Photoelectrons using Fast Ion Beams

Domesle, C. (2012). Momentum Imaging of Photofragments and Photoelectrons using Fast Ion Beams. PhD Thesis, Ruprecht-Karls-Universität, Heidelberg.

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Datensatz-Permalink: https://hdl.handle.net/11858/00-001M-0000-0010-1556-F Versions-Permalink: https://hdl.handle.net/11858/00-001M-0000-0010-1559-9
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Dissertation_C_Domesle.pdf (beliebiger Volltext), 8MB
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 Urheber:
Domesle, Christian1, Autor           
Wolf, Andreas, Gutachter
Dorn, Alexander, Gutachter
Affiliations:
1Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society, ou_904548              

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 Zusammenfassung: Within the framework of this thesis a method for break-up channel specific detection of the photoelectrons from photon-induced dissociation processes of fast moving molecular ion has been established. For this purpose, a novel saddlepoint electron spectrometer was commissioned while investigating the photodetachment dynamics on a fast moving beam of oxygen anions. For a complete detection of all outgoing reaction products emerging from the photolysis of small water clusters (H2O) nH+ (n ≤ 3) in the wavelength range of 13.5-40 nm a new fragment analyzing system has been developed and, in combination with the novel saddle-point spectrometer applied, to investigate the dissociative photoionization of the hydronium (H3O+) and the Zundel ion (H5O2 +). In case of the hydronium ion, a binary H2O+ + H+ and two three-body channels OH+ +2H+, OH+ +H+ +H have been identified to be initiated by outer valence vacancies where the binary channel is mainly triggered by the ionization of the 3a1 orbital and the three-body channels follow ionization from the 1e1 orbital. The photolysis of H5O2 + is found to proceed via five prominent pathways where for a large number of processes the hydronium ion is split off as a stable structural unit. Also here, the investigation of the photoelectron spectra revealed the prominent dissociation pathways to be initiated by outer valence vacancies.

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 Datum: 2012-07-04
 Publikationsstatus: Angenommen
 Seiten: 139 S. : Ill., graph. Darst.
 Ort, Verlag, Ausgabe: Heidelberg : Ruprecht-Karls-Universität
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 Art des Abschluß: Doktorarbeit

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