Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.143002
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Funding
- U.S. Army Research Office [W911NF-07-1-0475]
- NSF
- Division of Chemical Sciences, Office of Basic Energy Sciences, Office of Energy Research, U.S. DOE
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Autoionization of argon atoms was studied experimentally by transient absorption spectroscopy with isolated attosecond pulses. The peak position, intensity, linewidth, and shape of the 3s3p(6)np P-1 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(6)4p P-1 line is caused by the coupling between two short-lived highly excited states in the strong laser field.
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