Lay summary
Measurement of basic physical and chemical processes induced by an attachment of a free electron to a molecule or an atom. The molecules and atoms are chosen by relevance to plasma processing, lighting, atmospheric and space chemistry, radiation damage to living tissue, fusion plasma, and pure scientific interest. The latter concerns particularly new resonant phenomena near threshold and in the backward scattering, in scattering with complex molecules, and in collaborations with current development of scattering theory. Emphasis is on advanced technology, permitting the measurement of high-quality quantitative (absolute) cross sections for elastic scattering, vibrational and electronic excitation by electron impact, and dissociative electron attachment. Forefront development of new instrumentation to reach this goal is pursued.