Low temperature scattering with the R-matrix method: argon-argon scattering

Relativistic approach for e+/- scattering from argon.

Electron scattering and transport in liquid argon.

The transport of excess electrons in liquid argon driven out of equilibrium by an applied electric field is revisited using a multi-term solution of Boltzmann's equation together with ab initio liquid phase cross-sections calculated using the Dirac-Fock scattering equations. The calculation of liquid phase cross-sections extends previous treatments to consider multipole polarisabilities and a n...

Inelastic neutron scattering of hydrogen trapped in solid argon

2014 Molecular hydrogen was isolated in an argon matrix. Its inelastic neutron scattering functions at momentum transfers of 1 to 7 Å-1 were compared with those of solid hydrogen. Both samples show free rotation without line shift. At high momentum transfer (7 Å-1), the spectrum of pure hydrogen is affected by recoil, whereas no recoil effects could be seen in matrix isolated H,. Revue Phys. Ap...

Low-energy electron scattering with the purine bases of DNA/RNA using the R-matrix method.

R-matrix calculations on electron collisions with the purine bases found in DNA and RNA (i.e., adenine and guanine) are presented. Resonant anion states of these systems are identified by employing different approximation levels of ab initio theoretical methods, such as the static exchange, the static exchange plus polarization, and the close-coupling methods. The results are compared with othe...

Low-energy electron–argon scattering in a low-frequency laser field

We have used several non-perturbative Floquet methods to calculate the differential and total cross sections for electron scattering from argon in a CO2 laser field. One method utilizes the mixed-gauge R-matrix technique to calculate the scattering cross section. A diabatic approximation adopted from molecular applications is also applied to this low-frequency limit. Results are compared with t...