J. Phys. IV France 04 (1994) C4-647-C4-650
Four-photon ionization dynamics of xenonC. BORDAS1, M.J. DYER2, T.A. FAIRFIELD2, M. SAEED2 and H. HELM2
1 Laboratoire de Spectrométrie Ionique et Moléculaire, URA 171 du CNRS, Université Lyon I, Bât. 205, 43 Bd du 11 Novembre 1918, 69622 Villeurbanne cedex, France
2 Molecular Physics Laboratory, SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025, U.S.A.
Three-photon resonance enhanced four-photon ionization of xenon at wavelengths between 313 and 371 nm has been investigated by means of a novel photoelectron imaging spectrometer . Photoelectron images provide a direct view of the squared angular wave functions of the free electrons as well as their energy distribution. Preferential formation of Xe+ (2P1/2) is observed when intermediate ns [3/2] (J=1) states belonging to the 2P3/2 core series are excited in the three-photon step. The opposite behaviour is observed for the 7s' [1/2] (J=1) state. For the nd states the abundance of photoions in each fine structure state closely mirrors the core character of the three-photon intermediate.
© EDP Sciences 1994