Calculation of excitation and ionization for electron-molecule collisions at intermediate energies

The molecular R-matrix with pseudostates (MRMPS) method allows, for the first time, the calculation of totally ab initio cross sections for electron impact ionisation and electronic excitation above the first ionisation threshold of a molecule. The method is general and can be applied to multielectron targets. Results from its application to collisions with H-3(+) and H-2 are presented for illustrative purposes.