Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 26, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.263003
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Funding
- U.S. Army Research Office [W911NF-07-1-0475]
- NSF [0457269]
- Chemical Sciences, Geosciences, and Biosciences Division, U.S. Department of Energy
- Direct For Mathematical & Physical Scien
- Division Of Physics [0457269] Funding Source: National Science Foundation
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Helium atoms in the presence of extreme ultraviolet light pulses can lose electrons through direct photoionization or through two-electron excitation followed by autoionization. Here we demonstrate that, by combining attosecond extreme ultraviolet pulses with near infrared femtosecond lasers, electron dynamics in helium autoionization can be not only monitored but also controlled. Furthermore, the interference between the two ionization channels was modified by the intense near infrared laser pulse. To the best of our knowledge, this is the first time that double excitation and autoionization were studied experimentally by using isolated attosecond pulses.
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