Varvarezos, L.; Düsterer, S.; Kiselev, M.D.; Boll, R.; Bomme, C.; De Fanis, A.; Erk, B.; Passow, C.; Burkov, S.M.; Hartmann, G.; Ilchen, M.; Johnsson, P.; Kelly, T.J.; Manschwetus, B.; Mazza, T.; Meyer, M.; Rompotis, D.; Zatsarinny, O.; Gryzlova, E.V.; Grum-Grzhimailo, A.N.; Costello, J.T.: Near-threshold two-photon double ionization of Kr in the vacuum ultraviolet. Physical Review A 103 (2021), p. 022832/1-9
10.1103/physreva.103.022832
Open Accesn Version
Abstract:
We report angle-resolved measurements on photoelectrons emitted upon near-threshold two-photon double ionization (TPDI) of Kr irradiated by free-electron laser (FEL) pulses. These photoelectron angular distributions (PADs) are compared with the results of semirelativistic R-matrix calculations. As reported by Augustin et al., it is found that the presence of autoionizing resonances within the bandwidth of the exciting FEL pulse strongly influences the PADs. In contrast to measurements on lower-Z targets such as Ne and Ar, the larger spin-orbit interaction, inherent in 4p-subshell hole states of Kr, permits us to resolve and study PADs associated with some of the fine-structure components of the Kr+ and Kr2+ ions.