Subfemtosecond K-shell excitation with a few-cycle infrared laser field.
Subfemtosecond bursts of extreme ultraviolet radiation, facilitated by a process known as high-order harmonic generation, are a key ingredient for attosecond metrology, providing a tool to precisely initiate and probe ultrafast dynamics in the microcosms of atoms, molecules, and solids. These ultrashort pulses are always, and as a by-product of the way they are generated, accompanied by laser-induced recollisions of electrons with their parent ions. By using a few-cycle infrared (λ(0)=2.1 μm) driving laser, we were able to directly excite high-energy (∼870 eV) inner-shell electrons through laser-induced electron recollision, opening the door to time-resolved studies of core-level and concomitant multielectron dynamics.
Max-Planck-Institut für Quantenoptik, Garching, Germany. marcus@vms.huji.ac.il
Gilad
G
Marcus
Wolfram
W
Helml
Xun
X
Gu
Yunpei
Y
Deng
Robert
R
Hartmann
Takayoshi
T
Kobayashi
Lothar
L
Strueder
Reinhard
R
Kienberger
Ferenc
F
Krausz