Zobrazeno 1 - 10 of 71 pro vyhledávání: '"Keith A. Berrington"'
1
ELECTRON-ATOM SCATTERING AT INTERMEDIATE ENERGIES
Autor: Philip G. Burke, C V Sukumar, Keith A. Berrington
Over the last few years there has been much interest, both theoretically and experimentally, in electron-atom scattering at intermediate energies. The theoretical work has been driven mainly by the many applications in astronomy, laser physics and pl
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::be7125dfb96c17ce10e89bc5b1b34fd4
https://ora.ox.ac.uk/objects/uuid:9b4d451b-be04-43b4-8414-797f828a1c3b
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2
Partitioned R-matrix theory
Autor: Connor Ballance, Keith A. Berrington
Publikováno v: Journal of Physics B: Atomic, Molecular and Optical Physics. 35:2275-2282
The traditional implementation of R-matrix theory to electron scattering and photoionization requires the computationally demanding diagonalization of dense symmetric matrices of Hamiltonian elements. To make this task more efficient and to improve t
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e2b67d296efa80e210d534a76e049b21
https://doi.org/10.1088/0953-4075/35/10/307
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4
Inner-shell photoionization of the 3dxground state Fe ions
Autor: Keith A. Berrington, Connor Ballance
Publikováno v: Journal of Physics B: Atomic, Molecular and Optical Physics. 34:2697-2705
The total photoionization cross section for the 3dx ground state Fe ions, Fe III through Fe VIII, is calculated from the ionization threshold to the K edge including resonance features. The R-matrix method is used, the work being undertaken as part o
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::961d1d273cb4bbc07067ac378e757d2a
https://doi.org/10.1088/0953-4075/34/13/311
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5
Double ionization yields from the photoionization of FeIIand FeI
Autor: Keith A. Berrington, Connor Ballance
Publikováno v: Journal of Physics B: Atomic, Molecular and Optical Physics. 34:L383-L390
Photoionization cross sections for ground state Fe II and Fe I (3p63d64sx, x = 1 and 2) up to photon energies corresponding to ejection of an inner-shell 3p electron are calculated using the R-matrix method, in a first attempt at estimating the doubl
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4d4b66a208bf3e82be41c7abbe80cb5b
https://doi.org/10.1088/0953-4075/34/11/104
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6
Oscillator strengths of NaIII
Autor: Keith A. Berrington
Publikováno v: Journal of Physics B: Atomic, Molecular and Optical Physics. 34:1443-1451
Oscillator strengths for fine-structure transitions in F-like Na III are calculated for the first time ab initio using the Breit-Pauli opacity project (OP) R-matrix method. Many transitions are in excellent agreement with a recent CIV3 calculation by
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8e1bfe876ad9773f2e8f441a9f2896c9
https://doi.org/10.1088/0953-4075/34/8/309
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8
The QB program: Analysing resonances using R-matrix theory
Autor: J. C. Pelan, Lisa Quigley, Keith A. Berrington
Publikováno v: Computer Physics Communications. 114:225-235
A procedure for analysing resonances in atomic and molecular collision theory is programmed, which exploits the analytic properties of R-matrix theory to obtain the energy derivative of the reactance ( K ) matrix. This procedure is based on the QB me
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::dd455ce88a7a0065b8e89765e87c955d
https://doi.org/10.1016/s0010-4655(98)00059-9
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9
Interloper resonances in the transitory states of
Autor: Brendan M. McLaughlin, Keith A. Berrington, Connor Ballance
Publikováno v: Journal of Physics B: Atomic, Molecular and Optical Physics. 31:L655-L665
We have undertaken a detailed study of the various Rydberg resonance series found in the symmetry for electron collisions with molecular oxygen ions. A five-state valence CI approximation is used in our expansion of the target molecular states within
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8501770192a43cf28512c5010317e40e
https://doi.org/10.1088/0953-4075/31/15/003
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10
R-matrix Calculation of C III Bound and Continuum Fine-structure States
Autor: Lisa Quigley, Keith A. Berrington, J. C. Pelan
Publikováno v: Physica Scripta. 57:549-555
An approach to atomic structure calculations is described, using recent developments in the pseudo-state/R-matrix method, within the high optimization offered by close-coupling. These include the exploitation of the "QB" method for systematic resonan
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9cb8ceb6af2bb649c1fce7a2431783be
https://doi.org/10.1088/0031-8949/57/5/002
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