ORCID Profile
0000-0002-5804-8811
Current Organisation
Curtin University
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Atomic, Molecular, Nuclear, Particle and Plasma Physics | Atomic and Molecular Physics | Radiation Therapy | Plasma Physics; Fusion Plasmas; Electrical Discharges |
Expanding Knowledge in the Physical Sciences | Cancer and Related Disorders | Energy not elsewhere classified
Publisher: American Physical Society (APS)
Date: 03-11-2010
Publisher: IOP Publishing
Date: 2013
Publisher: AIP
Date: 2011
DOI: 10.1063/1.3585814
Publisher: American Physical Society (APS)
Date: 18-01-2006
Publisher: American Physical Society (APS)
Date: 10-02-2020
Publisher: WORLD SCIENTIFIC
Date: 10-2019
Publisher: American Physical Society (APS)
Date: 08-09-2014
Publisher: American Physical Society (APS)
Date: 17-01-2006
Publisher: IOP Publishing
Date: 05-06-2017
Publisher: American Physical Society (APS)
Date: 11-10-2010
Publisher: IOP Publishing
Date: 05-05-2021
Abstract: Positron scattering on atomic and molecular targets is a two-centre problem due to the possibility of rearrangement (Ps-formation) processes. In certain kinematic regions, single-centre expansion methods can be applied to two-centre scattering problems. In such approaches, however, information about Ps-formation and direct ionization processes are combined into excitation litudes of positive-energy pseudostates. In this report we show that Ps-formation litudes can be extracted using the total scattering wave function, which we reconstruct from single-centre convergent close-coupling calculations. The method is applied to positron scattering from hydrogen and lithium atomic targets. Excellent agreement with the two-centre theoretical benchmark results show the validity of the proposed technique.
Publisher: American Physical Society (APS)
Date: 24-10-2019
Publisher: IOP Publishing
Date: 31-07-2019
Publisher: Elsevier BV
Date: 08-2000
Publisher: American Physical Society (APS)
Date: 28-06-0012
Publisher: American Physical Society (APS)
Date: 08-10-2019
Publisher: IOP Publishing
Date: 07-09-2015
Publisher: American Physical Society (APS)
Date: 28-05-2019
Publisher: American Physical Society (APS)
Date: 02-12-2004
Publisher: American Physical Society (APS)
Date: 08-06-2010
Publisher: American Physical Society (APS)
Date: 28-07-2017
Publisher: Author(s)
Date: 2017
DOI: 10.1063/1.4984850
Publisher: American Physical Society (APS)
Date: 22-02-2016
Publisher: World Scientific Pub Co Pte Lt
Date: 2019
Publisher: American Physical Society (APS)
Date: 13-08-2009
Publisher: American Physical Society (APS)
Date: 07-09-2016
Publisher: American Physical Society (APS)
Date: 05-03-2012
Publisher: Springer Science and Business Media LLC
Date: 06-04-2019
Publisher: IOP Publishing
Date: 09-05-2016
Publisher: American Physical Society (APS)
Date: 23-11-2015
Publisher: American Physical Society (APS)
Date: 11-09-2015
Publisher: IOP Publishing
Date: 05-11-2012
Publisher: American Physical Society (APS)
Date: 08-08-2016
Publisher: American Physical Society (APS)
Date: 12-11-2020
Publisher: American Physical Society (APS)
Date: 12-03-2018
Publisher: American Physical Society (APS)
Date: 08-09-2023
Publisher: Springer Science and Business Media LLC
Date: 08-2023
DOI: 10.1140/EPJD/S10053-023-00743-0
Abstract: State-selective non-dissociative electron capture and ionisation cross sections are calculated for collisions between bare helium-ions and molecular hydrogen. The two-centre wave-packet convergent close-coupling approach is used and the hydrogen molecule is represented as an effective one-electron target. For the electron-capture cross section, our results are in good agreement with experimental measurements at energies above 100 keV/u. However, near the peak of the cross section, they are larger than the experimental data. The total ionisation cross section is also in good agreement with experiment, particularly at low and high energies. The results for the state-selective electron-capture cross section are generally in good agreement with the limited experimental measurements. However, we find that our results appear to consistently overestimate the experimental data for electron capture into the s states at intermediate energies. The present results are the first calculations capable of producing electron capture and ionisation cross sections over a wide incident energy range within a single unified theoretical framework.
Publisher: Springer Science and Business Media LLC
Date: 25-12-2022
Publisher: American Physical Society (APS)
Date: 05-02-2020
Publisher: IOP Publishing
Date: 11-2007
Publisher: American Physical Society (APS)
Date: 21-10-2021
Publisher: American Physical Society (APS)
Date: 29-10-2021
Publisher: IOP Publishing
Date: 07-09-2015
Publisher: Elsevier BV
Date: 06-2016
Publisher: American Physical Society (APS)
Date: 18-12-2019
Publisher: Springer Science and Business Media LLC
Date: 09-2020
Publisher: IOP Publishing
Date: 04-10-2023
Publisher: American Physical Society (APS)
Date: 15-08-2014
Publisher: IOP Publishing
Date: 2011
Publisher: American Physical Society (APS)
Date: 09-12-2011
Publisher: American Physical Society (APS)
Date: 29-04-2013
Publisher: Elsevier BV
Date: 03-2017
Publisher: Elsevier BV
Date: 11-2012
Publisher: Springer Science and Business Media LLC
Date: 02-10-2018
Publisher: Springer Science and Business Media LLC
Date: 07-2023
DOI: 10.1140/EPJD/S10053-023-00713-6
Abstract: Using the two-centre wave-packet convergent close-coupling approach, we continue our study of the proton–helium collision system. This method uses a correlated two-electron wave function to describe the helium target and discretises the continuum using wave-packet pseudostates. The cross section differential in the electron-emission energy and emission angle is calculated for incident-projectile energies in the intermediate range from 70 to 300 keV, where coupling between various channels and electron–electron correlation effects are important. We also apply an alternative, simpler approach that reduces the target to an effective single-electron system. Overall, the present results from both methods agree well with the available experimental data. This positions both implementations of the two-centre wave-packet convergent close-coupling approach well to further study other doubly differential, as well as fully differential, cross sections of single ionisation in proton–helium collisions.
Publisher: IOP Publishing
Date: 23-03-2011
Publisher: IOP Publishing
Date: 21-01-2016
Publisher: IOP Publishing
Date: 03-2023
Publisher: MDPI AG
Date: 11-02-2022
Abstract: The convergent close-coupling (CCC) method was initially developed to describe electron scattering on atomic hydrogen and the hydrogenic ions such as He+. The latter allows implementation of double photoionization (DPI) of the helium atom. For more complex single valence-electron atomic and ionic targets, the direct and exchange interaction with the inner electron core needs to be taken into account. For this purpose, the Hartree-Fock (HF) computer codes developed in the group of Miron Amusia have been adapted. In this brief review article, we demonstrate the utility of the HF technique by ex les of electron scattering on Li and the DPI of the H− and Li− ions. We also discuss that modern-day computer infrastructure allows the associated CCC code, and others, to be readily run directly via the Atomic, Molecular and Optical Science Gateway.
Publisher: IOP Publishing
Date: 02-2010
Publisher: American Physical Society (APS)
Date: 28-06-2007
Publisher: Elsevier BV
Date: 08-2020
Publisher: IOP Publishing
Date: 07-09-2015
Publisher: American Physical Society (APS)
Date: 28-07-2022
Publisher: IOP Publishing
Date: 2019
Publisher: American Physical Society (APS)
Date: 05-12-2008
Publisher: IOP Publishing
Date: 14-12-1995
Publisher: Elsevier BV
Date: 06-2001
Publisher: IOP Publishing
Date: 10-08-2016
Publisher: American Physical Society (APS)
Date: 30-03-2023
Publisher: AIP
Date: 2006
DOI: 10.1063/1.2165617
Publisher: Springer Science and Business Media LLC
Date: 18-07-2023
Publisher: American Physical Society (APS)
Date: 19-01-2023
Publisher: IOP Publishing
Date: 30-04-2019
Publisher: Springer Science and Business Media LLC
Date: 07-2022
DOI: 10.1140/EPJD/S10053-022-00442-2
Abstract: The recently developed two-centre wave-packet convergent close-coupling approach to proton collisions with molecular hydrogen is applied to calculate various singly differential cross sections. The approach is based on an effective one-electron description of the $${\\hbox {H}_2}$$ H 2 target. The angular differential cross sections for elastic scattering, total excitation and electron capture are presented. Furthermore, we calculate the singly differential ionisation cross sections as functions of the ejected-electron energy and angle, as well as projectile scattering angle. Good agreement with available experimental data is observed, providing improvement over previous theoretical investigations into the singly differential cross section for ionisation. Specific mechanisms responsible for electron emission in particular kinematic regimes are identified. It is concluded that the effective one-electron WP-CCC method is capable of providing reasonably accurate results on singly differential cross sections for all included interconnected processes taking place in $${\\hbox {p}}+{\\hbox {H}_2}$$ p + H 2 collisions.
Publisher: American Physical Society (APS)
Date: 27-06-2019
Publisher: American Physical Society (APS)
Date: 29-04-2019
Publisher: Springer Science and Business Media LLC
Date: 16-11-2017
DOI: 10.1038/S41467-017-01721-Y
Abstract: The interaction of antiprotons with low-energy positronium atoms is a fundamental three-body problem whose significance is its utility for formation of antihydrogen. Particular importance resides in understanding processes involving excited positronium states. Until recently such studies were performed using classical techniques. However, they become inapplicable in the low-energy domain. Here we report the results of comprehensive quantum calculations, which include initial excited positronium states with principal quantum numbers up to n i = 5. Contrary to expectation from earlier work, there are only muted increases in the cross-sections for antihydrogen formation for n i 3. We interpret this in terms of quantum suppression of the reaction at higher angular momenta. Furthermore, the cross-sections for elastic scattering are around two orders of magnitude higher, which we attribute to the degeneracy of the positronium states. We outline some experimental consequences of our results.
Publisher: IOP Publishing
Date: 2010
Publisher: American Physical Society (APS)
Date: 19-01-2016
Publisher: IOP Publishing
Date: 19-01-2010
Publisher: IOP Publishing
Date: 10-04-2014
Publisher: American Physical Society (APS)
Date: 28-08-2019
Publisher: Elsevier BV
Date: 02-2021
Publisher: IOP Publishing
Date: 20-05-2022
Abstract: Electron capture and ionisation in bare neon ion collisions with ground-state atomic hydrogen are modelled over the energy range from 1 to 2000 keV/u using the two-center semiclassical wave-packet convergent close-coupling method. The calculated total electron-capture cross section agrees very well with the molecular and atomic orbital close-coupling calculations at low and intermediate energies. Our results slightly overestimate the experimental results by Meyer et al [1985 Phys. Rev. A 32 3310], but underestimate the measurements by Panov et al [1983 Phys. Scr. T3 124] available only below 10 keV/u. At higher energies, where there are no measurements, the results also agree very well with the classical trajectory Monte-Carlo results. Partial n and nl -resolved electron-capture cross sections, important for fusion plasma diagnostics, have also been calculated for final states up to n = 10, where n and l are the final state principal and angular momentum quantum numbers, respectively. The results are generally in good agreement with the atomic calculations. However, due to the finer energy grid used, we are able to detect pronounced oscillations in the state-selective cross sections for n ⩾ 8 at energies below 10 keV/u. Our results for the total ionisation cross section are overall in good agreement with the latest classical trajectory Monte-Carlo results.
Publisher: American Physical Society (APS)
Date: 11-1996
Publisher: American Physical Society (APS)
Date: 19-12-2018
Publisher: American Physical Society (APS)
Date: 21-11-2018
Publisher: IOP Publishing
Date: 14-10-1994
Publisher: American Physical Society (APS)
Date: 02-04-2019
Publisher: IOP Publishing
Date: 08-09-2021
Publisher: IOP Publishing
Date: 28-08-1997
Publisher: IOP Publishing
Date: 22-02-2005
Publisher: American Physical Society (APS)
Date: 14-09-2021
Publisher: IOP Publishing
Date: 09-2009
Publisher: American Physical Society (APS)
Date: 17-07-2019
Publisher: IOP Publishing
Date: 11-06-2020
Publisher: American Physical Society (APS)
Date: 26-04-2017
Publisher: American Physical Society (APS)
Date: 16-11-2018
Publisher: American Physical Society (APS)
Date: 04-08-2017
Publisher: IOP Publishing
Date: 07-09-2015
Publisher: IOP Publishing
Date: 04-2016
Publisher: IOP Publishing
Date: 17-06-2020
Publisher: MDPI AG
Date: 10-11-2022
Abstract: The wave-packet convergent close-coupling approach is used to calculate integrated target excitation and ionisation cross sections in bare beryllium-ion collisions with the 2ℓm states of atomic hydrogen (where n, ℓ and m are the principal, orbital angular momentum and magnetic quantum numbers, respectively). The calculations are performed at representative projectile energies between 10 keV/u to 1 MeV/u. The calculated cross sections for collisions with H(2s) are compared with recent theoretical results. Generally, good agreement is observed for the n-partial excitation and total ionisation cross sections. However, a significant discrepancy is found for excitation into the dominant n=3 states at 100 keV/u, where the target excitation cross-section peaks. We also present the first calculations of the excitation and ionisation cross sections for Be4+ collisions with H(2p0) and H(2p±1).
Publisher: Elsevier BV
Date: 07-2009
Publisher: Springer Science and Business Media LLC
Date: 12-2008
Publisher: American Physical Society (APS)
Date: 24-11-2021
Publisher: American Physical Society (APS)
Date: 04-08-2023
Publisher: IOP Publishing
Date: 13-12-2007
Publisher: American Physical Society (APS)
Date: 25-10-2013
Publisher: American Physical Society (APS)
Date: 07-12-2012
Publisher: IOP Publishing
Date: 06-2010
Publisher: IOP Publishing
Date: 08-2018
Publisher: American Physical Society (APS)
Date: 05-07-2016
Publisher: IOP Publishing
Date: 26-07-2011
Publisher: IOP Publishing
Date: 25-08-2000
Publisher: American Physical Society (APS)
Date: 21-12-2022
Publisher: American Physical Society (APS)
Date: 30-01-2018
Publisher: MDPI AG
Date: 12-2022
Abstract: The two-center wave-packet convergent close-coupling method has been applied to model the processes of electron capture and ionisation in collisions of fully stripped neon and lithium ions with atomic hydrogen at projectile energies from 1 keV/u to 1 MeV/u. For the Ne10+ projectile, the resulting total electron-capture cross section lies between the two sets of experimental results available for system, which differ from each other significantly. For Li3+, our total electron-capture cross section agrees with the available experimental measurements by Shah et al. [J. Phys. B: At. Mol. Opt. Phys 11, L233 (1978)] and Seim et al. [J. Phys. B: At. Mol. Opt. Phys 14, 3475 (1981)], particularly at low and high energies. We also get good agreement with the existing theoretical works, particularly the atomic- and molecular-orbital close-coupling calculations. Our total ionisation cross section overestimates the experimental data by Shah et al. [J. Phys. B: At. Mol. Opt. Phys 15, 413 (1982)] at the peak, however we get good agreement with the other existing theoretical calculations at low and high energies.
Publisher: American Physical Society (APS)
Date: 08-05-2015
Publisher: Elsevier BV
Date: 06-2019
Publisher: IOP Publishing
Date: 05-11-2012
Publisher: Springer Science and Business Media LLC
Date: 02-2022
DOI: 10.1140/EPJD/S10053-022-00359-W
Abstract: The two-centre wave-packet convergent close-coupling approach to ion–atom collisions is extended to study proton collisions with molecular hydrogen including electron-capture channels. We use a model potential to represent the molecular target as an effective one-electron spherically symmetric system. This greatly simplifies the target structure, allowing us to use already existing code developed for ion collisions with single-electron targets. Calculated total cross sections for electron capture, single ionisation, and excitation processes generally agree well with experimental data and other theoretical calculations where available. However, the total electron capture cross section is found to overestimate the experimental data at low energies, while the total ionisation cross section is slightly underestimated. Additionally, we present state-resolved cross sections for capture into the 1s, 2 $$\\ell $$ ℓ , and 3 $$\\ell $$ ℓ states of the projectile where deviation between various previous calculations is substantial. Our results lead to overall improvement over previous theoretical studies although discrepancies with experiment are observed for 3p and 3d capture. We conclude that treating molecular hydrogen as an effective one-electron system within the two-centre coupled-channel approach to one-electron targets can give reasonably accurate total cross sections at intermediate and high energies, without the need for a complex and computationally demanding two-electron target representation.
Publisher: IOP Publishing
Date: 05-11-2012
Publisher: MDPI AG
Date: 14-08-2023
Abstract: We extend the two-centre wave-packet convergent close-coupling approach to doubly differential ionisation in proton collisions with H2 to intermediate projectile energies. The results for the doubly differential cross section at projectile energies from 48 to 200 keV are presented as a function of the energy and angle of emitted electrons. We consider a wide range of emission angles from 10 to 160∘, and compare our results to experimental data, where available. Excellent agreement between the presented results and the experimental data was found, especially for emission angles less than 130∘. For very large backward emission angles our calculations tended to slightly overestimate the experimental data when energetic electrons are ejected and the doubly differential cross section is very small. This discrepancy may be due to the large uncertainties in the experimental data in this region and the model target description. Overall, the present results show significant improvement upon currently available theoretical results and provide a consistently accurate description of this process across a wide range of incident energies.
Publisher: American Physical Society (APS)
Date: 14-12-2010
Publisher: IOP Publishing
Date: 11-2009
Publisher: American Physical Society (APS)
Date: 13-09-2005
Publisher: Springer Science and Business Media LLC
Date: 04-2018
Publisher: IOP Publishing
Date: 04-2011
Publisher: IOP Publishing
Date: 10-04-2014
Publisher: IOP Publishing
Date: 24-10-2016
Publisher: American Physical Society (APS)
Date: 06-12-2021
Publisher: American Physical Society (APS)
Date: 28-04-2014
Publisher: American Physical Society (APS)
Date: 26-12-2018
Publisher: American Physical Society (APS)
Date: 13-07-2016
Publisher: IOP Publishing
Date: 10-04-2014
Publisher: IOP Publishing
Date: 03-12-2020
Publisher: Elsevier BV
Date: 11-2015
Publisher: WORLD SCIENTIFIC
Date: 12-2008
Publisher: AIP
Date: 2005
DOI: 10.1063/1.1932953
Publisher: American Physical Society (APS)
Date: 05-02-2018
Publisher: EDP Sciences
Date: 2010
Publisher: IOP Publishing
Date: 10-04-2014
Publisher: AIP
Date: 2005
DOI: 10.1063/1.1932951
Publisher: IOP Publishing
Date: 14-01-1992
Publisher: IOP Publishing
Date: 05-11-2012
Publisher: American Physical Society (APS)
Date: 24-09-2012
Publisher: IOP Publishing
Date: 12-09-2005
Publisher: WORLD SCIENTIFIC
Date: 2007
Publisher: AIP Publishing
Date: 05-2015
DOI: 10.1063/1.4919674
Abstract: Due to the long-range character of the Coulomb interaction theoretical description of low-energy nuclear reactions with charged particles still remains a formidable task. One way of dealing with the problem in an integral-equation approach is to employ a screened Coulomb potential. A general approach without screening requires folding of kernels of the integral equations with the Coulomb wave. A new method of folding a function with the Coulomb partial waves is presented. The partial-wave Coulomb function both in the configuration and momentum representations is written in the form of separable series. Each term of the series is represented as a product of a factor depending only on the Coulomb parameter and a function depending on the spatial variable in the configuration space and the momentum variable if the momentum representation is used. Using a trial function, the method is demonstrated to be efficient and reliable.
Publisher: American Physical Society (APS)
Date: 06-09-2016
Location: Russian Federation
Start Date: 2016
End Date: 2018
Funder: Australian Research Council
View Funded ActivityStart Date: 2018
End Date: 2020
Funder: Australian Research Council
View Funded ActivityStart Date: 2019
End Date: 2021
Funder: Australian Research Council
View Funded ActivityStart Date: 03-2019
End Date: 12-2024
Amount: $420,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2018
End Date: 08-2023
Amount: $431,435.00
Funder: Australian Research Council
View Funded ActivityStart Date: 2016
End Date: 05-2019
Amount: $415,300.00
Funder: Australian Research Council
View Funded Activity