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Vibrationally resolved partial cross sections and asymmetry parameters for nitrogen K-shell photoionization of the N2O molecule
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.ORCID iD: 0000-0002-9647-0394
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2007 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 76, no 1, 012506- p.Article in journal (Refereed) Published
Abstract [en]

We have measured the vibrationally resolved partial cross sections σ(v1,v2,v3) and asymmetry parameters β(v1,v2,v3) for Nc and Nt K-shell photoionization of the N2O molecule in the σ* shape resonance region above the Nt and Nc K-shell ionization thresholds. Nc K-shell photoionization of the N2O molecule predominantly causes the excitation of the quasisymmetric vibrations (v1), whereas Nt K-shell photoionization causes both quasisymmetric and quasiantisymmetric vibrations (v1 and v3) to be excited. The shape resonance energy in the Nc K-shell photoionization increases with an increase in v1. The β(v1,0,0) curves for the Nc K-shell photoionization exhibit maxima at energies close to the shape resonance energies for the individual values of v1. The shape resonance energy in the Nt K-shell photoionization decreases with an increase in v1 and slightly increases with an increase in v3. The β(v1,0,0) curves show a significant state dependence in the region of the shape resonance, with the curves shifting to lower energy as v1 increases. The vibrational state dependence of the cross sections σ(v1,v2,v3) and asymmetry parameters β(v1,v2,v3) are well reproduced by the theoretical calculations using the multichannel Schwinger configuration interaction (MCSCI) method, including both the Nc and Nt ion states.

Place, publisher, year, edition, pages
2007. Vol. 76, no 1, 012506- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-95808DOI: 10.1103/PhysRevA.76.012506ISI: 000248486600081OAI: oai:DiVA.org:uu-95808DiVA: diva2:170152
Available from: 2007-04-24 Created: 2007-04-24 Last updated: 2017-12-14
In thesis
1. Soft X-ray Scattering Dynamics Close to Core Ionization Thresholds in Atoms and Molecules
Open this publication in new window or tab >>Soft X-ray Scattering Dynamics Close to Core Ionization Thresholds in Atoms and Molecules
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this Thesis studies of highly excited states in gas-phase atoms and molecules (He, Ne, N2, O2, N2O and CO2) using a variety of synchrotron-radiation based techniques are presented. The three techniques used most frequently are X-ray-emission-threshold-electron coincidence (XETECO), X-ray emission spectroscopy (XES) and X-ray photoelectron spectroscopy (XPS) and they are all given a brief introduction.

The fluorescence yield (FY) from doubly excited states in helium near the N=2 threshold(s) has been investigated in weak static external magnetic and electric fields, but also in a field free environment. The FY spectra in weak static magnetic fields show the importance of including the diamagnetic interaction in the theoretical models. The presence of weak static electric fields shows that even weak fields (as low as 44 V/cm) has a great impact on the observed FY spectra. Resonant XES spectra from some of the first doubly excited states in helium has been recorded in a field free environment, and compared to theory.

The XETECO technique is presented and the first XETECO results from Ne, N2, O2, CO2 and N2O are shown, together with interpretations of possible threshold dynamics. I show that XETECO can be interpreted as threshold photoelectron spectra free from post collision interaction, and can hence be compared to above threshold XPS measurements. The observed below-threshold structures in the XETECO spectra are discussed and given a tentative explanation. The results from the analysis of the N2O XETECO spectrum lead to further investigations using XPS. Results showing the vibrational parameters and vibrationally resolved cross-sections and asymmetry parameters for N2O are presented together with theoretical predictions.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2007. 106 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 297
Keyword
Physics, Soft X-ray emission, Resonant inelastic X-ray scattering, Double excitations, Helium, X-ray-emission-threshold-electron coincidence, Fysik
Identifiers
urn:nbn:se:uu:diva-7832 (URN)978-91-554-6874-3 (ISBN)
Public defence
2007-05-16, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15
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Available from: 2007-04-24 Created: 2007-04-24 Last updated: 2011-01-24Bibliographically approved

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Söderström, JohanRubensson, Jan-Erik

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