ConvergentRmatrix with pseudostates calculation fore−-He collisions

Abstract

The R matrix with pseudostates method has been used to study e Ϫ -He collisions at low and intermediate energies up to 80 eV. Since target correlation effects and target continuum states are both accurately represented by this method, the associated program package can now be used to obtain reliable results at intermediate energies for more complex atomic and ionic targets, which are urgently required in many applications.

Benchmark experiment and theory for near-threshold excitation of helium by electron impact

“…The details of this calculation were described by Bartschat et al (1996) and Hudson et al (1996). The principal purpose of presenting results based on work performed 10 years ago is to illustrate to what extent this pioneering RMPS calculation for e-He collisions withstood the test of time.…”

Electron-Collision-Induced Alignment of Rare Gases near Threshold

“…This sophisticated basis set, in combination with the inclusion of the one-electron relativistic BreitPauli terms in the Hamiltonian, gives us confidence in the reliability of our results for excitation of the heavy noble gases in the near-threshold region. The present calculation represents the first step towards a converged "R-matrix with pseudostates" [18,19] (RMPS) treatment of this complicated problem which, following the RMPS' success for light nonrelativistic targets, would be highly desirable at intermediate energies.…”

2DRMP: A suite of two-dimensional R-matrix propagation codes

“…(22). The size of the Hamiltonian matrix, ipcount-1, is determined by the permissible values of n 1 l 1 and n 2 l 2 in Eq.…”

“…Two R-matrix approaches have been developed to represent this coupling with acceptable accuracy. The first is the R-matrix with Pseudostates Method (RMPS) [21][22][23][24]. Here, the standard R-matrix target eigenstate expansion is augmented by the inclusion of additional quadratically integrable pseudostates.…”