Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.123601
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Funding
- NCCR Quantum Photonics (NCCR QP), a research instrument of the Swiss National Science Foundation (SNSF)
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We perform attosecond time-resolved transient absorption spectroscopy around the first ionization threshold of helium and observe rapid oscillations of the absorption of the individual harmonics as a function of time delay with respect to a superimposed, moderately strong infrared laser field. The phase relation between the absorption modulation of individual harmonics gives direct evidence for the interference of transiently bound electronic wave packets as the mechanism behind the absorption modulation.
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