Interaction of short wavelength photons with atomic and molecular ions: 50 years some examples

Steve Manson has been involved with the study of the photoionisation of atomic ions since the early 70's. Over the half century since, much has happened in terms of theory and experiment. This short paper provides some examples of the inner-shell photoionisation of atomic ions, which demonstrate different experimental approaches and the important ongoing symbiotic nature of combined theoretical and experimental studies. Recent initiatives in the study of the photoionisation of small molecular ions are also briefly described.