Electrons are both efficient exciters of molecular modes and can drive molecular dissociation. I will report on recent calculations performed in my group studying electron collisions with small molecules. These include:

1. Rotational excitation of interstellar molecular ions. Recent work has focused on rotational excitation rates for the newly discovered argonium ion (ArH+) as well as re-evaluation of rates for electron collisions with CH+ and HeH+.

2, Dissociative recombination of N2+. A very extensive study of this system, which is particularly hard to perform measurements on, provides low-energy cross sections as a function of N2+ vibrational state.

3, Vibrational excitation cross sections for CO, NO, N2 and O2. As part of the EU-funded Phys4Entry project, comprehensive datasets of vibrational excitation cross sections have been calcuated which consider excitation/dexcitation from all target vibrational states.

4. Dissociative electron attachment and electron impact dissociation of O2 has been considered as a function of O2 vibrational states.

These results will be summarised at the meeting.