Wang, HeChini, MichaelChen, ShouyuanZhang, Chang-HuaHe, FengCheng, YanWu, YiThumm, Uwe P. E.Chang, Zenghu2013-05-312013-05-312010-10-01http://hdl.handle.net/2097/15872Autoionization of argon atoms was studied experimentally by transient absorption spectroscopy with isolated attosecond pulses. The peak position, intensity, linewidth, and shape of the 3s3p[superscript 6]np [superscript 1]P 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 3s3p[superscript 6]4p [superscript 1]P line is caused by the coupling between two short-lived highly excited states in the strong laser field.en-USThis Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).AutoionizationArgonTransient absorption spectroscopyElectron correlationArticle (publisher version)