(e,2e) ionization of helium and the hydrogen molecule: signature of two-centre interference effects
Identifieur interne : 008904 ( Main/Exploration ); précédent : 008903; suivant : 008905(e,2e) ionization of helium and the hydrogen molecule: signature of two-centre interference effects
Auteurs : E M Staicu Casagrande [France] ; A. Naja [France] ; F. Mezdari [France] ; A. Lahmam-Bennani [France] ; P. Bolognesi [Italie] ; B. Joulakian [France] ; O. Chuluunbaatar [Russie] ; O. Al-Hagan [États-Unis] ; D H Madison [États-Unis] ; D V Fursa [Australie] ; I. Bray [Australie]Source :
- Journal of Physics B: Atomic, Molecular and Optical Physics [ 0953-4075 ] ; 2008.
Descripteurs français
- Pascal (Inist)
- 3480D, 3480G, Approximation couplage proche, Collision électron atome, Collision électron molécule, Composé minéral, Etude comparative, Etude théorique, H2, He, Hydrogène Molécule, Hélium Atome, Ionisation impact électron, Longueur onde de Broglie, Molécule diatomique, Section efficace triplement différentielle.
- Wicri :
- topic : Composé minéral.
English descriptors
- KwdEn :
- Absolute scale, Angular distribution, Angular distributions, Angular range, Atomic hydrogen, Binary, Binary lobe, Binary lobes, Binary peak, Broglie wavelength, Casagrande, Close coupling approximation, Comparative study, Constructive character, Continuum electrons, Correct boundary conditions, De Broglie wavelength, Diatomic molecules, Direct comparison, Ejection, Ejection angle, Electron angle, Electron energies, Electron energy, Electron impact, Electron impact ionization, Electron-atom collisions, Electron-molecule collisions, Exit channels, Experimental data, Experimental procedure, Experimental ratio, Experimental results, Full lines, Good agreement, Gure, Gures, Hanssen, Helium Atoms, Helium atom, Highest energy, Hydrogen Molecules, Hydrogen molecule, Incident energy, Inorganic compounds, Interference effect, Interference effects, Interference factor, Interference process, Ionization, Ionization process, Lowest energies, Molecular case, Molecular hydrogen, Momentum transfer direction, Oamo approximation, Orsay cedex, Other hand, Outgoing electrons, Phys, Present experiments, Present study, Present work, Recoil, Recoil intensity, Recoil peak, Recoil region, Simultaneous observation, Solid circles, Staicu, Staicu casagrande, Stia, Target core, Tdcs, Tdcs distribution, Theoretical calculations, Theoretical models, Theoretical prediction, Theoretical study, Triply differential cross section.
- Teeft :
- Absolute scale, Angular distribution, Angular distributions, Angular range, Atomic hydrogen, Binary, Binary lobe, Binary lobes, Binary peak, Broglie wavelength, Casagrande, Constructive character, Continuum electrons, Correct boundary conditions, Diatomic molecules, Direct comparison, Ejection, Ejection angle, Electron angle, Electron energies, Electron energy, Electron impact, Electron impact ionization, Exit channels, Experimental data, Experimental procedure, Experimental ratio, Experimental results, Full lines, Good agreement, Gure, Gures, Hanssen, Helium atom, Highest energy, Hydrogen molecule, Incident energy, Interference effect, Interference effects, Interference factor, Interference process, Ionization, Ionization process, Lowest energies, Molecular case, Molecular hydrogen, Momentum transfer direction, Oamo approximation, Orsay cedex, Other hand, Outgoing electrons, Phys, Present experiments, Present study, Present work, Recoil, Recoil intensity, Recoil peak, Recoil region, Simultaneous observation, Solid circles, Staicu, Staicu casagrande, Stia, Target core, Tdcs, Tdcs distribution, Theoretical calculations, Theoretical models, Theoretical prediction.
Abstract
Relative (e,2e) triply differential cross sections (TDCS) are measured for the ionization of the helium atom and the hydrogen molecule in coplanar asymmetric geometry at a scattered electron energy of 500 eV and ejected electron energies of 205, 74 and 37 eV. The He experimental results are found to be in very good agreement with convergent close-coupling calculations (CCC). The H2 experimental results are compared with two state-of-the-art available theoretical models for treating differential electron impact ionization of molecules. Both models yield an overall good agreement with experiments, except for some intensity deviations in the recoil region. Similar (e,2e) works were recently published on H2 with contrasted conclusions to the hypothesis that the two H nuclei could give rise to an interference pattern in the TDCS structure. Murray (2005 J. Phys. B: At. Mol. Opt. Phys. 38 1999) found no evidence for such an effect, whereas Milne-Brownlie et al (2006 Phys. Rev. Lett. 96 233201) reported its indirect observation. In this work, based on a direct comparison between experimental results for He and H2, we observe an oscillatory pattern due to these interference effects, and for the first time the destructive or constructive character of the interference is observed, depending on the de Broglie wavelength of the ejected electron wave. The experimental finding is in good agreement with the theoretical prediction by Stia et al (2003 J. Phys. B: At. Mol. Opt. Phys. 36 L257).
Url:
DOI: 10.1088/0953-4075/41/2/025204
Affiliations:
- Australie, France, Italie, Russie, États-Unis
- Grand Est, Lorraine (région), Île-de-France
- Metz, Orsay
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Bray</name><affiliation wicri:level="1"><country xml:lang="fr">Australie</country><wicri:regionArea>ARC Centre for Excellence for Antimatter-Matter Studies, Curtin University of Technology, GPO Box U1987, Perth, WA 6845</wicri:regionArea><wicri:noRegion>WA 6845</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Physics B: Atomic, Molecular and Optical Physics</title><title level="j" type="abbrev">J. Phys. B: At. Mol. Opt. Phys.</title><idno type="ISSN">0953-4075</idno><idno type="eISSN">1361-6455</idno><imprint><publisher>IOP Publishing</publisher><date type="published" when="2008">2008</date><biblScope unit="volume">41</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="1">1</biblScope><biblScope unit="page" to="7">7</biblScope><biblScope unit="production">Printed in the UK</biblScope></imprint><idno type="ISSN">0953-4075</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0953-4075</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Absolute scale</term><term>Angular distribution</term><term>Angular distributions</term><term>Angular range</term><term>Atomic hydrogen</term><term>Binary</term><term>Binary lobe</term><term>Binary lobes</term><term>Binary peak</term><term>Broglie wavelength</term><term>Casagrande</term><term>Close coupling approximation</term><term>Comparative study</term><term>Constructive character</term><term>Continuum electrons</term><term>Correct boundary conditions</term><term>De Broglie wavelength</term><term>Diatomic molecules</term><term>Direct comparison</term><term>Ejection</term><term>Ejection angle</term><term>Electron angle</term><term>Electron energies</term><term>Electron energy</term><term>Electron impact</term><term>Electron impact ionization</term><term>Electron-atom collisions</term><term>Electron-molecule collisions</term><term>Exit channels</term><term>Experimental data</term><term>Experimental procedure</term><term>Experimental ratio</term><term>Experimental results</term><term>Full lines</term><term>Good agreement</term><term>Gure</term><term>Gures</term><term>Hanssen</term><term>Helium Atoms</term><term>Helium atom</term><term>Highest energy</term><term>Hydrogen Molecules</term><term>Hydrogen molecule</term><term>Incident energy</term><term>Inorganic compounds</term><term>Interference effect</term><term>Interference effects</term><term>Interference factor</term><term>Interference process</term><term>Ionization</term><term>Ionization process</term><term>Lowest energies</term><term>Molecular case</term><term>Molecular hydrogen</term><term>Momentum transfer direction</term><term>Oamo approximation</term><term>Orsay cedex</term><term>Other hand</term><term>Outgoing electrons</term><term>Phys</term><term>Present experiments</term><term>Present study</term><term>Present work</term><term>Recoil</term><term>Recoil intensity</term><term>Recoil peak</term><term>Recoil region</term><term>Simultaneous observation</term><term>Solid circles</term><term>Staicu</term><term>Staicu casagrande</term><term>Stia</term><term>Target core</term><term>Tdcs</term><term>Tdcs distribution</term><term>Theoretical calculations</term><term>Theoretical models</term><term>Theoretical prediction</term><term>Theoretical study</term><term>Triply differential cross section</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>3480D</term><term>3480G</term><term>Approximation couplage proche</term><term>Collision électron atome</term><term>Collision électron molécule</term><term>Composé minéral</term><term>Etude comparative</term><term>Etude théorique</term><term>H2</term><term>He</term><term>Hydrogène Molécule</term><term>Hélium Atome</term><term>Ionisation impact électron</term><term>Longueur onde de Broglie</term><term>Molécule diatomique</term><term>Section efficace triplement différentielle</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Absolute scale</term><term>Angular distribution</term><term>Angular distributions</term><term>Angular range</term><term>Atomic hydrogen</term><term>Binary</term><term>Binary lobe</term><term>Binary lobes</term><term>Binary peak</term><term>Broglie wavelength</term><term>Casagrande</term><term>Constructive character</term><term>Continuum electrons</term><term>Correct boundary conditions</term><term>Diatomic molecules</term><term>Direct comparison</term><term>Ejection</term><term>Ejection angle</term><term>Electron angle</term><term>Electron energies</term><term>Electron energy</term><term>Electron impact</term><term>Electron impact ionization</term><term>Exit channels</term><term>Experimental data</term><term>Experimental procedure</term><term>Experimental ratio</term><term>Experimental results</term><term>Full lines</term><term>Good agreement</term><term>Gure</term><term>Gures</term><term>Hanssen</term><term>Helium atom</term><term>Highest energy</term><term>Hydrogen molecule</term><term>Incident energy</term><term>Interference effect</term><term>Interference effects</term><term>Interference factor</term><term>Interference process</term><term>Ionization</term><term>Ionization process</term><term>Lowest energies</term><term>Molecular case</term><term>Molecular hydrogen</term><term>Momentum transfer direction</term><term>Oamo approximation</term><term>Orsay cedex</term><term>Other hand</term><term>Outgoing electrons</term><term>Phys</term><term>Present experiments</term><term>Present study</term><term>Present work</term><term>Recoil</term><term>Recoil intensity</term><term>Recoil peak</term><term>Recoil region</term><term>Simultaneous observation</term><term>Solid circles</term><term>Staicu</term><term>Staicu casagrande</term><term>Stia</term><term>Target core</term><term>Tdcs</term><term>Tdcs distribution</term><term>Theoretical calculations</term><term>Theoretical models</term><term>Theoretical prediction</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Composé minéral</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">Relative (e,2e) triply differential cross sections (TDCS) are measured for the ionization of the helium atom and the hydrogen molecule in coplanar asymmetric geometry at a scattered electron energy of 500 eV and ejected electron energies of 205, 74 and 37 eV. The He experimental results are found to be in very good agreement with convergent close-coupling calculations (CCC). The H2 experimental results are compared with two state-of-the-art available theoretical models for treating differential electron impact ionization of molecules. Both models yield an overall good agreement with experiments, except for some intensity deviations in the recoil region. Similar (e,2e) works were recently published on H2 with contrasted conclusions to the hypothesis that the two H nuclei could give rise to an interference pattern in the TDCS structure. Murray (2005 J. Phys. B: At. Mol. Opt. Phys. 38 1999) found no evidence for such an effect, whereas Milne-Brownlie et al (2006 Phys. Rev. Lett. 96 233201) reported its indirect observation. In this work, based on a direct comparison between experimental results for He and H2, we observe an oscillatory pattern due to these interference effects, and for the first time the destructive or constructive character of the interference is observed, depending on the de Broglie wavelength of the ejected electron wave. The experimental finding is in good agreement with the theoretical prediction by Stia et al (2003 J. Phys. B: At. Mol. Opt. Phys. 36 L257).</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li><li>Italie</li><li>Russie</li><li>États-Unis</li></country><region><li>Grand Est</li><li>Lorraine (région)</li><li>Île-de-France</li></region><settlement><li>Metz</li><li>Orsay</li></settlement></list><tree><country name="France"><region name="Île-de-France"><name sortKey="Staicu Casagrande, E M" sort="Staicu Casagrande, E M" uniqKey="Staicu Casagrande E" first="E M" last="Staicu Casagrande">E M Staicu Casagrande</name></region><name sortKey="Joulakian, B" sort="Joulakian, B" uniqKey="Joulakian B" first="B" last="Joulakian">B. Joulakian</name><name sortKey="Lahmam Bennani, A" sort="Lahmam Bennani, A" uniqKey="Lahmam Bennani A" first="A" last="Lahmam-Bennani">A. Lahmam-Bennani</name><name sortKey="Lahmam Bennani, A" sort="Lahmam Bennani, A" uniqKey="Lahmam Bennani A" first="A" last="Lahmam-Bennani">A. Lahmam-Bennani</name><name sortKey="Mezdari, F" sort="Mezdari, F" uniqKey="Mezdari F" first="F" last="Mezdari">F. Mezdari</name><name sortKey="Mezdari, F" sort="Mezdari, F" uniqKey="Mezdari F" first="F" last="Mezdari">F. Mezdari</name><name sortKey="Naja, A" sort="Naja, A" uniqKey="Naja A" first="A" last="Naja">A. Naja</name><name sortKey="Naja, A" sort="Naja, A" uniqKey="Naja A" first="A" last="Naja">A. Naja</name><name sortKey="Staicu Casagrande, E M" sort="Staicu Casagrande, E M" uniqKey="Staicu Casagrande E" first="E M" last="Staicu Casagrande">E M Staicu Casagrande</name></country><country name="Italie"><noRegion><name sortKey="Bolognesi, P" sort="Bolognesi, P" uniqKey="Bolognesi P" first="P" last="Bolognesi">P. Bolognesi</name></noRegion></country><country name="Russie"><noRegion><name sortKey="Chuluunbaatar, O" sort="Chuluunbaatar, O" uniqKey="Chuluunbaatar O" first="O" last="Chuluunbaatar">O. Chuluunbaatar</name></noRegion></country><country name="États-Unis"><noRegion><name sortKey="Al Hagan, O" sort="Al Hagan, O" uniqKey="Al Hagan O" first="O" last="Al-Hagan">O. Al-Hagan</name></noRegion><name sortKey="Madison, D H" sort="Madison, D H" uniqKey="Madison D" first="D H" last="Madison">D H Madison</name></country><country name="Australie"><noRegion><name sortKey="Fursa, D V" sort="Fursa, D V" uniqKey="Fursa D" first="D V" last="Fursa">D V Fursa</name></noRegion><name sortKey="Bray, I" sort="Bray, I" uniqKey="Bray I" first="I" last="Bray">I. Bray</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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