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Ways of determining and characterising resonances in scattering processes
Stockholm University, Faculty of Science, Department of Physics.
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Scattering cross sections very often display structures. To clarify if these structures correspond to resonances one has to check if they are poles of the scattering matrix (S-matrix) in the fourth quadrant of the complex momentum plane. Furthermore, the states corresponding to these poles also need to have an appropriate scattering amplitude.

The complex energies of resonances associated with several potentials were computed by solving complex dilated differential equations using both a Numerov method and a Finite Element Method as well as by solving integral equations with a δ-potentials technique combined with the complex dilation method.

The influence of resonances on the s-wave cross section for model one channel potentials was studied using the Mittag-Leffler and the Green's function expansion formalisms and comparisons made between these two approaches. It is demonstrated how the partial wave S-matrix can be continued into a sector in the fourth quadrant of the complex momentum plane where its poles and residues can be determined. These two formally equivalent methods were found to produce numerically identical S-matrix residues. However, both methods have essential drawbacks and, therefore, a technique for identifying the contribution of individual resonances to the cross section, which is based on the S-matrix residue, is suggested. This involves defining both a reduced partial wave S-matrix and reduced cross section. The technique presented here is successfully applied to the two-channel Noro-Taylor potential and a more realistic scattering process, namely the N3+ + H → NH3+ → N2+ + H+ reaction.

Note that my name can be spelt in different ways. In official documents it is Kseniya Shyliayeva but in all papers I used another spelling, namely: Ksenia Shilyaeva.

 

Place, publisher, year, edition, pages
Stockholm: Department of Physics, Stockholm University , 2009. , 55 p.
Keyword [en]
quantum scattering theory, complex scaling, resonances
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
URN: urn:nbn:se:su:diva-26218ISBN: 978-91-7155-838-1 (print)OAI: oai:DiVA.org:su-26218DiVA: diva2:207884
Public defence
2009-04-24, FA 32, Roslagstullsbacken 21, AlbaNova universitetcentrum, 10:00 (English)
Opponent
Supervisors
Available from: 2009-04-03 Created: 2009-03-13 Last updated: 2009-03-17Bibliographically approved
List of papers
1. Tools for assigning resonance structures in collisions of few body quantum systems
Open this publication in new window or tab >>Tools for assigning resonance structures in collisions of few body quantum systems
Show others...
2006 (English)In: Few-body systems, ISSN 0177-7963, Vol. 38, no 2-4, 109-114 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-26235 (URN)10.1007/s00601-005-0144-9 (DOI)
Available from: 2009-03-15 Created: 2009-03-15 Last updated: 2009-04-03Bibliographically approved
2. Role of resonances in building cross sections: A comparison between the Mittag-Leffler and the Lippman Schwiger approaches
Open this publication in new window or tab >>Role of resonances in building cross sections: A comparison between the Mittag-Leffler and the Lippman Schwiger approaches
2007 (English)In: International Journal of Quantum Chemistry, ISSN 0020-7608, Vol. 107, no 6, 1301-1315 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-12441 (URN)10.1002/qua.21257 (DOI)000244771500003 ()
Available from: 2008-01-15 Created: 2008-01-15 Last updated: 2009-03-16Bibliographically approved
3. The role of resonances in building cross sections: The Mittag-Leffler expansion in a two channel scattering
Open this publication in new window or tab >>The role of resonances in building cross sections: The Mittag-Leffler expansion in a two channel scattering
2009 (English)In: International Journal of Quantum Chemistry, ISSN 0020-7608, Vol. 109, no 3, 414-424 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-26236 (URN)10.1002/qua.21807 (DOI)000262012700003 ()
Available from: 2009-03-15 Created: 2009-03-15 Last updated: 2009-04-03Bibliographically approved
4. Identifying resonance structures in a scattering cross section using the N3+ + H -> NH3+ -> N2+ + H+ reaction as an example
Open this publication in new window or tab >>Identifying resonance structures in a scattering cross section using the N3+ + H -> NH3+ -> N2+ + H+ reaction as an example
2009 (English)In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, Vol. 42, no 4, 044011- p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-26238 (URN)10.1088/0953-4075/42/4/044011 (DOI)000263061100012 ()
Available from: 2009-03-15 Created: 2009-03-15 Last updated: 2009-03-16Bibliographically approved
5. Integral equations for the Jost solutions and decaying resonance states
Open this publication in new window or tab >>Integral equations for the Jost solutions and decaying resonance states
2006 (English)In: Proceedings of the Gomel State University, 2006, Vol. 6, 3-8 p.Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:su:diva-26239 (URN)
Available from: 2009-03-15 Created: 2009-03-15 Last updated: 2009-03-16Bibliographically approved
6. Integral equations for different wavefunctions and their use in finding resonances
Open this publication in new window or tab >>Integral equations for different wavefunctions and their use in finding resonances
2009 (English)In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, Vol. 42, no 4, 044001- p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-26240 (URN)10.1088/0953-4075/42/4/044001 (DOI)000263061100002 ()
Available from: 2009-03-15 Created: 2009-03-15 Last updated: 2009-03-16Bibliographically approved

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