Double core-hole creation by sequential attosecond photoionization.
X-ray fluorescence spectroscopy demonstrates that a single core-hole krypton with a 170-as lifetime can be photoionized again to a double core-hole state by an intense x-ray pulse. The observation indicates that unconventional interaction between intense x rays and atoms is no more negligible in applications with x-ray free-electron lasers. Quantitative analysis of the double core-hole creation including effects of a pulsed and spiky temporal structure enables estimation of the x-ray pulse duration in the sub-10-fs range.
RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan. tamasaku@riken.jp
Kenji
K
Tamasaku
Mitsuru
M
Nagasono
Hiroshi
H
Iwayama
Eiji
E
Shigemasa
Yuichi
Y
Inubushi
Takashi
T
Tanaka
Kensuke
K
Tono
Tadashi
T
Togashi
Takahiro
T
Sato
Tetsuo
T
Katayama
Takashi
T
Kameshima
Takaki
T
Hatsui
Makina
M
Yabashi
Tetsuya
T
Ishikawa