期刊
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
卷 46, 期 20, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0953-4075/46/20/205601
关键词
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资金
- 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)
- Management Expenses Grants for National Universities Corporations from MEXT
- Scientific Research from JSPS [21244062, 22740264]
- IMRAM research program
- 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 [22740264, 21244062, 25286064] Funding Source: KAKEN
The photoelectron angular distributions (PADs) have been investigated for infrared (IR) ionization of He atoms excited to Rydberg states by extreme ultraviolet free-electron laser pulses. The experiment was carried out with two pulses which do not overlap in time. Depending on the intensity of the IR pulses, one IR photon ionization or additionally two-photon above-threshold ionization is observed. For low IR intensity, the PAD is well described by a contribution of s and d partial waves in accordance with early experiments. At high IR intensity, the PAD for two IR photon ionization clearly shows the contribution of higher partial waves. The experimental data are compared with the results of theoretical calculations based on solving the time-dependent Schrodinger equation.
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