Subfemtosecond K-shell excitation with a few-cycle infrared laser field

Gilad Marcus*, Wolfram Helml, Xun Gu, Yunpei Deng, Robert Hartmann, Takayoshi Kobayashi, Lothar Strueder, Reinhard Kienberger, Ferenc Krausz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


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=2.1μm) driving laser, we were able to directly excite high-energy (∼870eV) inner-shell electrons through laser-induced electron recollision, opening the door to time-resolved studies of core-level and concomitant multielectron dynamics.

Original languageAmerican English
Article number023201
JournalPhysical Review Letters
Issue number2
StatePublished - 10 Jan 2012


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