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An energy resolved electron-ion coincidence study near the S 2p thresholds of the SF6 molecule
KTH, Superseded Departments, Physics.
KTH, Superseded Departments, Physics.
KTH, Superseded Departments, Physics.
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2003 (English)In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 36, no 4, 781-791 p.Article in journal (Refereed) Published
Abstract [en]

The fragmentation dynamics of the SF6 molecule following the excitations of S 2p electrons into unoccupied molecular orbitals has been studied using the energy-resolved electron-ion coincidence technique. Fragmentation patterns were found to depend on the particular excitation and on the electronic state of the molecular ion. The spectator resonant Auger decay at the 2p --> 6a(1g) resonance induces changes in the ion distributions as compared to direct photoionization. Furthermore, coincidence spectra related to the same Auger structure display different ion abundances at the 2t(2g) and 4e(g) shape resonances. Differences were also found in the Auger decay spectra. These findings give further support for the previously suggested many-electron character of the 4e(g) shape resonance.

Place, publisher, year, edition, pages
2003. Vol. 36, no 4, 781-791 p.
Keyword [en]
fragmentation, photoionization, resolution, spectra, states, shell
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-22651DOI: 10.1088/0953-4075/36/4/310ISI: 000184012300016OAI: oai:DiVA.org:kth-22651DiVA: diva2:341349
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. 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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Rachlew, Elisabeth

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Kivimäki, AnttiAlvarez Ruiz, JesusErman, PeterMelero Garcia, EmilioRachlew, ElisabethRius i Riu, JaumeStankiewicz, Marek
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