Journal
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Volume 44, Issue 16, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-4075/44/16/161001
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT)
- Grants-in-Aid for Scientific Research [19002006] Funding Source: KAKEN
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The resonant and non-resonant two-photon single ionization processes of He were investigated using intense free electron laser light in the extreme ultraviolet (XUV) region (53.4-61.4 nm) covering the 1s-2p and 1s-3p resonant transitions of He. On the basis of the dependences of the yield of He+ on the XUV light-field intensity at 53.4, 58.4, 56.0 and 61.4 nm, the absolute values of the two-photon ionization cross sections of He at the four different wavelengths and their dependence on the light-field intensity were determined for the first time.
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