Near-threshold two-photon double ionization of Kr in the vacuum ultraviolet
- Varvarezos, Lazaros
- Düsterer, Stefan
- Ilchen, Markus
- Johnsson, Per
- Kelly, Thomas J.
- Manschwetus, Bastian
- Mazza, Tommaso
- Meyer, Michael
- Rompotis, Dimitrios
- Zatsarinny, Oleg
- Gryzlova, Elena
- Grum-Grzhimailo, Alexei N.
- Kiselev, Maksim D.
- Costello, John
- Boll, Rebecca
- Bomme, Cedric
- De Fanis, Alberto
- Erk, Benjamin
- Passow, Christopher
- Burkov, Sergei M.
- Hartmann, Gregor
DOIAbstract
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. [Phys. Rev. A 98, 033408 (2018)], 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 Kr...
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