15-stateR-matrix investigation of resonances in elastic scattering of electrons from atomic hydrogen at low energies

Abstract

A 15-state R-matrix calculation has been carried out at 685 energies ranging from 1 -17 eV to depict the resonant profiles for the elastic differential cross sections and the angular distribution of the spin asymmetry A &, i, (O, k ) in the elastic scattering of spin-polarized electrons by spin-polarized hydrogen atoms at angles of 30', 55', 70', and 90'. The calculations are compared with experiments. PACS number(s): 34.80.8m, 34.80.Nz

A benchmark calculation for resonant electron - hydrogen elastic scattering at low energies

“…In response to the calculation of Fon et al (1993) which reported that the spin asymmetry is more sensitive to resonance effects than spin-averaged cross sections, McCarthy and Shang (1993) carried out calculations on differential cross sections (DCS) and spin symmetries at 90 • and 30 • over the energies of the lowest 1 S and 3 P resonances in the elastic channel using a nine-state CCO in which the ionization continuum is represented by an equivalent local polarization potential. To demonstrate the importance of continuum effects, a coupledchannel (CC) calculation using the same nine-state basis without the local optical potential was also performed.…”

“…In figure 2, we compare the DNM calculation with those of CCO (McCarthy and Shang 1993) and the 15-state R-matrix calculation (Fon et al 1993). The 15-state R-matrix method does not include ionization continuum effects.…”