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Core-excitation-induced dissociation in CD4 after participator Auger decay
KTH, Superseded Departments, Physics.
KTH, Superseded Departments, Physics.
KTH, Superseded Departments, Physics.
KTH, Superseded Departments, Physics.
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2003 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 68, no 2Article in journal (Refereed) Published
Abstract [en]

The fragmentation of the CD4 molecule after selective ionization of the 1t(2) and 2a(1) electrons with photons from 70 to 290 eV has been studied with the energy-resolved electron-ion coincidence technique. The mass spectra acquired in coincidence with 1t(2) electrons reveal CD4+, CD3+, and CD2+ fragments, depending on the excitation energy used. The production of CD3+ is strongly enhanced after C 1s excitation to different core excited states, with respect to the production observed after direct ionization of the 1t(2) orbital. This enhancement is correlated with the changes of the molecular geometry when it relaxes from the core-excited state.

Place, publisher, year, edition, pages
2003. Vol. 68, no 2
Keywords [en]
k-shell excitation, electron-ion coincidence, ch4, spectroscopy, molecules, methane, spectrum, impact, photoionization, fragmentation
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-22793DOI: 10.1103/PhysRevA.68.022715ISI: 000185192100070OAI: oai:DiVA.org:kth-22793DiVA, id: diva2:341491
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Synchrotron radiation spectroscopy of molecular dynamics beyond the valence shell
Open this publication in new window or tab >>Synchrotron radiation spectroscopy of molecular dynamics beyond the valence shell
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis presents experimental results on molecular spectroscopy of gas phase molecules using synchrotron radiation. It deals mainly with dynamical processes following resonant excitation of electrons from core and inner-valence shells of the following systems H2O, H2, SF6 and CD4. In order to reach these deep electrons and excite them photons in the energy range from 25 to 550 eV were used, depending on the particular system.

Two experimental techniques are used. Photon induced fluorescence spectroscopy is used to study the fluorescence emission of fragments after the decay of resonant coreexcited states for the water molecule, and after doubly excited states and resonant excitations of inner-shell electrons for H2 and SF6 respectively. Only the emission in the visible and near infrared range (300-900nm) and the Lyman-α transitions are measured. Energy resolved electron-ion coincidence is used for the study of the fragmentation of CD4 and SF6 after selective ionisation of one of the outer-valence orbitals. In the case of CD4 the fragmentation is compared for the cases in which the ionisation is done directly, or through participator Auger decay of different resonantly core-excited states.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. p. xiv, 59
Series
Trita-FYS, ISSN 0280-316X ; 2006:13
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-3899 (URN)91-7178-294-X (ISBN)
Public defence
2006-04-20, Sal FB 53, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100910Available from: 2006-04-05 Created: 2006-04-05 Last updated: 2010-09-10Bibliographically approved

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Rachlew, Elisabeth

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