Velocity map imaging was implemented at the free electron laser in Hamburg to image atomic and molecular photoionization processes at a photon energy of 45.55 eV. High quality momentum distributions were recorded for a range of rare gases (He, Ne, Ar, Kr and Xe) and small molecules (H2, D2, O2, N2, CO2). This proof-of-principle experiment illustrates the potential for using velocity map imaging in order to study non-linear ionization and/or dissociation processes.
J. Mod. Opt.

Johnsson, P., Siu, W., Gijsbertsen, A., Verhoeven, J., Meijer, A. S., van der Zande, W. J., & Vrakking, M. J. J. (2008). Velocity map imaging of atomic and molecular processes at the free electron laser in Hamburg (FLASH). J. Mod. Opt., 55, 2693–2709. doi:10.1080/09500340802393062