Journal
PHYSICAL REVIEW A
Volume 89, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.89.013415
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Funding
- X-Ray Free Electron Laser (XFEL) Utilization Research Project
- XFEL Priority Strategy Program of Ministry of Education, Culture, Sports, Science, and Technology of Japan (MEXT)
- MEXT
- Japan Society for the Promotion of Science (JSPS) [21244062, 22740264]
- IMRAM research program
- IMRAM, Tohoku University
- APSA Project (Japan)
- KAKENHI [23656043, 25286064]
- Cooperative Research Program of Network Joint Research Center for Materials and Devices (Japan)
- Grants-in-Aid for Scientific Research [23241033, 23656043, 23550017, 23600006, 22740264, 25286064] Funding Source: KAKEN
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Photoelectron angular distributions (PADs) from two-photon near-threshold ionization of Ne atoms by the combined action of femtosecond pulses from an extreme ultraviolet (EUV) free-electron laser and infrared (IR) laser have been studied experimentally and theoretically. Solutions of the time-dependent Schr odinger equation indicate that the PADs strongly depend on the time delay between EUV and IR pulses. The experimental results obtained for two extreme cases of completely overlapping and nonoverlapping pulses fully confirm the prediction, illustrating that the measurements of the time-delay dependence of the PAD provide a tool for investigating the fundamental problem of the relative importance of the resonant and nonresonant pathways in the two-color two-photon processes.
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