期刊
PHYSICAL REVIEW A
卷 103, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.103.022832
关键词
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资金
- Max Planck Society
- BMBF [05K10KT2, 05K13KT2, 05K16KT3, 05K10KTB, FSP-302]
- Basis Foundation
- Russian Federation for Basic Research (RFBR) [2052-12023]
- Volkswagen foundation within a Peter Paul Ewald-Fellowship
- Swedish Research Council
- Swedish Foundation for Strategic Research
- Deutsche Forschungsgemeinschaft (DFG) [SFB925/1]
- Education, Audio-visual and Culture Executive Agency (EACEA) Erasmus Mundus Joint Doctorate Programme EXTATIC [2013 0033]
- Science Foundation Ireland [16/RI/3696, 19/FFP/6956]
- EU H2020 COST Action [CA17126]
- SEAI Grant [19/RDD/556]
This study investigates angle-resolved measurements of photoelectrons emitted during near-threshold two-photon double ionization of Kr irradiated by free-electron laser pulses. It demonstrates the strong influence of autoionizing resonances within the bandwidth of the exciting FEL pulse on the photoelectron angular distributions. Additionally, the larger spin-orbit interaction in the 4p-subshell hole states of Kr allows for the resolution and study of fine-structure components associated with Kr+ and Kr2+ ions.
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 Kr2+ ions.
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