期刊
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
卷 46, 期 16, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-4075/46/16/164018
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT)
- MEXT
- JSPS [21244062, 22740264]
- IMRAM research programme
- APSA Project (Japan)
- KAKENHI [23656043, 23104708]
- Chinese Academy of Sciences [KJCX2.YW.W10]
- Cooperative Research Program of Network Joint Research Center for Materials and Devices
- Nederlandse organisatie voor Wetenschappelijk Onderzoek (NWO)
- Swedish Research Council
- Swedish Foundation for Strategic Research
- Grants-in-Aid for Scientific Research [23241033, 21244062, 22740264, 26870006, 23656043] Funding Source: KAKEN
The two-photon ionization of helium atoms by ultrashort extreme-ultraviolet free-electron laser pulses, produced by the SPring-8 Compact SASE Source test accelerator, was investigated at photon energies of 20.3, 21.3, 23.0 and 24.3 eV. The angular distribution of photoelectrons generated by two-photon ionization is obtained using a velocity map imaging spectrometer. The phase-shift differences and amplitude ratios of the outgoing s and d continuum wave packets are extracted from the photoelectron angular distributions. The obtained values of the phase-shift differences are distinct from scattering phase-shift differences when the photon energy is tuned to a resonance with an excited level or Rydberg manifold. The difference stems from the co-presence of resonant and non-resonant path contributions in the two-photon ionization by femtosecond pulses. Since the relative contribution of both paths can be controlled in principle by the pulse shape, these results illustrate a new way to tailor the continuum wave packet.
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