Serveur d'exploration sur le thulium

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Photoionization of atomic thulium in the region of the 5p excitations

Identifieur interne : 001261 ( Main/Exploration ); précédent : 001260; suivant : 001262

Photoionization of atomic thulium in the region of the 5p excitations

Auteurs : S B Whitfield [États-Unis] ; K. Caspary [États-Unis] ; R. Wehlitz [États-Unis] ; M. Martins [Allemagne]

Source :

RBID : ISTEX:9F9098C093BBB3BB3415F77B52CFBB6FB208CB61

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English descriptors

Abstract

The partial cross sections, , and the angular distribution parameters, , of the photoelectrons originating from the 4f and 6s subshells of atomic thulium have been measured in the region of the 5p excitations (23 eV38 eV). In qualitative agreement with a previous absorption study, our curves show two regions of strong resonance enhancement, one around a photon energy of 27 eV corresponding to 5p3/2 excitations and the other near 32 eV corresponding to 5p1/2 excitations. The curves show considerable variation between the allowed extremes of 1.0 and 2.0 for many of the 4f photolines. In addition, the 6s photoline shows very marked deviations from 2.0 which is indicative of an open-shell atom. We also compare our experimental results with our calculated 4f partial cross sections. While there is excellent qualitative agreement between theory and experiment, quantitative details are not reproduced: (i) the 5p3/2 excitations are too narrow, (ii) while the 5p1/2 excitations have an intensity that is substantially less than what is observed experimentally.

Url:
DOI: 10.1088/0953-4075/41/1/015001


Affiliations:


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Le document en format XML

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<term>Angular distribution</term>
<term>Angular distributions</term>
<term>Atomic thulium</term>
<term>Autoionizing resonances</term>
<term>Average value</term>
<term>Behaviour</term>
<term>Binding energies</term>
<term>Binding energy</term>
<term>Bottom panel</term>
<term>Broad resonance</term>
<term>Broad resonances</term>
<term>Broader resonances</term>
<term>Continuum state</term>
<term>Continuum states</term>
<term>Curves show</term>
<term>Data sets</term>
<term>Decay channel</term>
<term>Destructive interference</term>
<term>Differential spectra</term>
<term>Direct photoionization</term>
<term>Direct photoionization channel</term>
<term>Dynamical behaviour</term>
<term>Electron binding energy</term>
<term>Electron intensity</term>
<term>Excellent agreement</term>
<term>Excitation</term>
<term>Experimental data</term>
<term>Experimental data sets</term>
<term>Experimental spectra</term>
<term>Experimental spectrum</term>
<term>Experimental study</term>
<term>Experimental widths</term>
<term>General behaviour</term>
<term>General shape</term>
<term>Giant resonance</term>
<term>Giant resonances</term>
<term>Good agreement</term>
<term>Gross behaviour</term>
<term>Ground state</term>
<term>Gure</term>
<term>Gures</term>
<term>Higher photon energies</term>
<term>Indirect excitation</term>
<term>Integral values</term>
<term>Intensity distribution</term>
<term>Interference effects</term>
<term>Ionization</term>
<term>Ionization channels</term>
<term>Ionization thresholds</term>
<term>Linear polarization</term>
<term>Magic angle</term>
<term>Main resonance</term>
<term>Mainline</term>
<term>Mainlines</term>
<term>Major role</term>
<term>Middle panel</term>
<term>Narrow resonances</term>
<term>Narrower resonances</term>
<term>Open shell atom</term>
<term>Optical data</term>
<term>Other lines</term>
<term>Partial cross section</term>
<term>Photoelectron</term>
<term>Photoelectron lines</term>
<term>Photoelectron measurements</term>
<term>Photoelectron peaks</term>
<term>Photoelectron spectra</term>
<term>Photoelectron studies</term>
<term>Photoionization</term>
<term>Photoionization dynamics</term>
<term>Photoline</term>
<term>Photolines</term>
<term>Photon</term>
<term>Photon beam</term>
<term>Photon energies</term>
<term>Photon energy</term>
<term>Photon energy range</term>
<term>Photon energy region</term>
<term>Phys</term>
<term>Polarization vector</term>
<term>Principal quantum number</term>
<term>Qualitative agreement</term>
<term>Quantitative agreement</term>
<term>Relative intensity</term>
<term>Resonance</term>
<term>Resonance excitations</term>
<term>Resonance region</term>
<term>Rydberg</term>
<term>Rydberg excitations</term>
<term>Satellite channels</term>
<term>Satellite intensity</term>
<term>Single calculations</term>
<term>Source volume anisotropies</term>
<term>Spectrum</term>
<term>Step size</term>
<term>Strongest resonances</term>
<term>Subshell</term>
<term>Synchrotron radiation</term>
<term>Theoretical calculation</term>
<term>Theoretical results</term>
<term>Theoretical spectra</term>
<term>Theoretical study</term>
<term>Thulium Atoms</term>
<term>Total absorption</term>
<term>Tracy</term>
<term>Transition elements</term>
<term>Upper panel</term>
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<keywords scheme="Pascal" xml:lang="fr">
<term>3280F</term>
<term>Atome couche incomplète</term>
<term>Distribution angulaire</term>
<term>Energie liaison électronique</term>
<term>Etude expérimentale</term>
<term>Etude théorique</term>
<term>Excitation</term>
<term>Photoionisation</term>
<term>Photoélectron</term>
<term>Section efficace partielle</term>
<term>Spectre photoélectron</term>
<term>Th</term>
<term>Thulium Atome</term>
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<keywords scheme="Teeft" xml:lang="en">
<term>Additional details</term>
<term>Angular distributions</term>
<term>Atomic thulium</term>
<term>Autoionizing resonances</term>
<term>Average value</term>
<term>Behaviour</term>
<term>Binding energies</term>
<term>Binding energy</term>
<term>Bottom panel</term>
<term>Broad resonance</term>
<term>Broad resonances</term>
<term>Broader resonances</term>
<term>Continuum state</term>
<term>Continuum states</term>
<term>Curves show</term>
<term>Data sets</term>
<term>Decay channel</term>
<term>Destructive interference</term>
<term>Differential spectra</term>
<term>Direct photoionization</term>
<term>Direct photoionization channel</term>
<term>Dynamical behaviour</term>
<term>Electron intensity</term>
<term>Excellent agreement</term>
<term>Excitation</term>
<term>Experimental data</term>
<term>Experimental data sets</term>
<term>Experimental spectra</term>
<term>Experimental spectrum</term>
<term>Experimental widths</term>
<term>General behaviour</term>
<term>General shape</term>
<term>Giant resonance</term>
<term>Giant resonances</term>
<term>Good agreement</term>
<term>Gross behaviour</term>
<term>Ground state</term>
<term>Gure</term>
<term>Gures</term>
<term>Higher photon energies</term>
<term>Indirect excitation</term>
<term>Integral values</term>
<term>Intensity distribution</term>
<term>Interference effects</term>
<term>Ionization</term>
<term>Ionization channels</term>
<term>Ionization thresholds</term>
<term>Linear polarization</term>
<term>Magic angle</term>
<term>Main resonance</term>
<term>Mainline</term>
<term>Mainlines</term>
<term>Major role</term>
<term>Middle panel</term>
<term>Narrow resonances</term>
<term>Narrower resonances</term>
<term>Optical data</term>
<term>Other lines</term>
<term>Photoelectron</term>
<term>Photoelectron lines</term>
<term>Photoelectron measurements</term>
<term>Photoelectron peaks</term>
<term>Photoelectron spectra</term>
<term>Photoelectron studies</term>
<term>Photoionization</term>
<term>Photoionization dynamics</term>
<term>Photoline</term>
<term>Photolines</term>
<term>Photon</term>
<term>Photon beam</term>
<term>Photon energies</term>
<term>Photon energy</term>
<term>Photon energy range</term>
<term>Photon energy region</term>
<term>Phys</term>
<term>Polarization vector</term>
<term>Principal quantum number</term>
<term>Qualitative agreement</term>
<term>Quantitative agreement</term>
<term>Relative intensity</term>
<term>Resonance</term>
<term>Resonance excitations</term>
<term>Resonance region</term>
<term>Rydberg</term>
<term>Rydberg excitations</term>
<term>Satellite channels</term>
<term>Satellite intensity</term>
<term>Single calculations</term>
<term>Source volume anisotropies</term>
<term>Spectrum</term>
<term>Step size</term>
<term>Strongest resonances</term>
<term>Subshell</term>
<term>Synchrotron radiation</term>
<term>Theoretical calculation</term>
<term>Theoretical results</term>
<term>Theoretical spectra</term>
<term>Total absorption</term>
<term>Tracy</term>
<term>Transition elements</term>
<term>Upper panel</term>
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<front>
<div type="abstract">The partial cross sections, , and the angular distribution parameters, , of the photoelectrons originating from the 4f and 6s subshells of atomic thulium have been measured in the region of the 5p excitations (23 eV38 eV). In qualitative agreement with a previous absorption study, our curves show two regions of strong resonance enhancement, one around a photon energy of 27 eV corresponding to 5p3/2 excitations and the other near 32 eV corresponding to 5p1/2 excitations. The curves show considerable variation between the allowed extremes of 1.0 and 2.0 for many of the 4f photolines. In addition, the 6s photoline shows very marked deviations from 2.0 which is indicative of an open-shell atom. We also compare our experimental results with our calculated 4f partial cross sections. While there is excellent qualitative agreement between theory and experiment, quantitative details are not reproduced: (i) the 5p3/2 excitations are too narrow, (ii) while the 5p1/2 excitations have an intensity that is substantially less than what is observed experimentally.</div>
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<name sortKey="Wehlitz, R" sort="Wehlitz, R" uniqKey="Wehlitz R" first="R" last="Wehlitz">R. Wehlitz</name>
<name sortKey="Whitfield, S B" sort="Whitfield, S B" uniqKey="Whitfield S" first="S B" last="Whitfield">S B Whitfield</name>
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<name sortKey="Martins, M" sort="Martins, M" uniqKey="Martins M" first="M" last="Martins">M. Martins</name>
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