title: Attosecond time-resolved autoionization of argon.
abstract: Autoionization of argon atoms was studied experimentally by transient absorption spectroscopy with isolated attosecond pulses. The peak position, intensity, linewidth, and shape of the 3s3p⁶np ¹P Fano resonance series (26.6-29.2 eV) were modified by intense few-cycle near infrared laser pulses, while the delay between the attosecond pulse and the laser pulse was changed by a few femtoseconds. Numerical simulations revealed that the experimentally observed splitting of the 3s3p⁶4p ¹P line is caused by the coupling between two short-lived highly excited states in the strong laser field.
authors.affiliation: J.R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA.
authors.forename: He
authors.initials: H
authors.lastname: Wang
authors.forename: Michael
authors.initials: M
authors.lastname: Chini
authors.forename: Shouyuan
authors.initials: S
authors.lastname: Chen
authors.forename: Chang-Hua
authors.initials: CH
authors.lastname: Zhang
authors.forename: Feng
authors.initials: F
authors.lastname: He
authors.forename: Yan
authors.initials: Y
authors.lastname: Cheng
authors.forename: Yi
authors.initials: Y
authors.lastname: Wu
authors.forename: Uwe
authors.initials: U
authors.lastname: Thumm
authors.forename: Zenghu
authors.initials: Z
authors.lastname: Chang