Configuration space method to calculate rearrangement matrix elements

Utamuratov, Ravshanbek; Fursa, Dmitry V.; Kadyrov, Alisher; Bray, Igor

doi:10.1016/j.cpc.2019.01.010

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…Within the CCC method the two-centre approach has been applied to positron scattering from atoms [26] and H 2 [27,28]. However, the two-centre approach is computationally demanding and relatively complicated to implement, particularly for charged targets [29,30]. An attractive alternative is a single-centre formulation, which utilises an expansion on the target centre only.…”

Section: Methodsmentioning

confidence: 99%

Calculations of positron scattering on the hydrogen molecular ion

Mori

Utamuratov

Scarlett

et al. 2019

J. Phys. B: At. Mol. Opt. Phys.

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Positron scattering from the vibrational ground state of the hydrogen molecular ion has been investigated using the single-centre convergent close-coupling (CCC) method. Cross sections for dissociative excitation, dissociative ionisation, total inelastic scattering, and proton production have been calculated at incident positron energies from 10 to 500 eV. For this energy range the mass stopping power and mean excitation energy have also been calculated for both the positron and electron cases. Since there are no experiments or other calculations for positron scattering on the hydrogen molecular ion, the obtained results have been compared with corresponding CCC results for positron collisions with He+ and electron collisions with . Comparative analysis allows to estimate the quality of the approximations used in the present calculations.

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Section: Methodsmentioning

confidence: 99%

Calculations of positron scattering on the hydrogen molecular ion

Mori

Utamuratov

Scarlett

et al. 2019

J. Phys. B: At. Mol. Opt. Phys.

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“…The details and derivations of the partial-wave forms of transition matrix elements are reported in reference [6,25]. In this work we are interested in calculating Ps-formation cross section from the solution of the single-centre CCC calculations.…”

Section: Partial-wave Formsmentioning

confidence: 99%

“…Therefore, to be consistent, we use a local-exchange approximation in both single-and two-centre calculations. Details can be found in reference [25].…”

Section: Positron Scattering On Lithiummentioning

confidence: 99%

Extraction of Ps-formation cross-sections from single-centre positron-scattering calculations

Utamuratov¹,

Fursa²,

Kadyrov³

et al. 2021

J. Phys. B: At. Mol. Opt. Phys.

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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 amplitudes of positive-energy pseudostates. In this report we show that Ps-formation amplitudes 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.

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