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Synchrotron radiation induced fluorescence spectroscopy of SF6
KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
KTH, School of Engineering Sciences (SCI), Physics, Atomic and Molecular Physics.
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2005 (English)In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 38, 387- p.Article in journal (Refereed) Published
Abstract [en]

The fluorescence of gaseous SF6 was investigated after excitation with 25-80eV synchrotron radiation photons. The total UV-Vis-near IR fluorescence yield was recorded and interpreted in terms of inner valence excitations/ionizations and double excitations in SF6. Dispersed fluorescence measurements in the 400-1000 nm spectral range reveal excited S, S+, F and F+ fragments as solely responsible for the emission. The fluorescence intensity of some of the observed atomic transitions was monitored as a function of the excitation energy. Single, double and triple excitations as well as direct ionizations and shake-ups are proposed as the triggering processes responsible for the creation of the emitting fragments.

Place, publisher, year, edition, pages
2005. Vol. 38, 387- p.
Keyword [en]
threshold photoelectron-spectroscopy, electron-impact, sulfur-hexafluoride, vacuum-ultraviolet, cross-sections, inner-valence, energy, shell, photoabsorption, fragmentation
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-5537DOI: 10.1088/0953-4075/38/4/006ISI: 000228249700007Scopus ID: 2-s2.0-14544275080OAI: oai:DiVA.org:kth-5537DiVA: diva2:9934
Note
QC 20100910Available from: 2006-04-05 Created: 2006-04-05 Last updated: 2017-11-21Bibliographically 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. xiv, 59 p.
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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Publisher's full textScopushttp://www.iop.org/EJ/abstract/0953-4075/38/4/006

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Rachlew, Elisabeth

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