Dissociative recombination by frame transformation to Siegert pseudostates: A comparison with a numerically solvable model

0506569 - ÚFCH JH 2020 RIV US eng J - Journal Article
Hvizdoš, Dávid - Váňa, M. - Houfek, K. - Greene, C. H. - Rescigno, T.N. - McCurdy, C.W. - Čurík, Roman
Dissociative recombination by frame transformation to Siegert pseudostates: A comparison with a numerically solvable model.
Physical Review A. Roč. 97, č. 2 (2018), č. článku 022704. ISSN 2469-9926. E-ISSN 2469-9934
R&D Projects: GA ČR(CZ) GA18-02098S
Institutional support: RVO:61388955
Keywords : quantum-defect theory * 1-sigma-g+ states * hydrogen * collisions * scattering * curves
OECD category: Physical chemistry
Impact factor: 2.907, year: 2018
Method of publishing: Limited access

We present a simple two-dimensional model of the indirect dissociative recombination process. The model has one electronic and one nuclear degree of freedom and it can be solved to high precision, without making any physically motivated approximations, by employing the exterior complex scaling method together with the finite-elements method and discrete variable representation. The approach is applied to solve a model for dissociative recombination of H-2(+) in the singlet ungerade channels, and the results serve as a benchmark to test validity of several physical approximations commonly used in the computational modeling of dissociative recombination for real molecular targets. The second, approximate, set of calculations employs a combination of multichannel quantum defect theory and frame transformation into a basis of Siegert pseudostates. The cross sections computed with the two methods are compared in detail for collision energies from 0 to 2 eV.
Permanent Link: http://hdl.handle.net/11104/0297799