Attosecond electron spectroscopy using a novel interferometric pump-probe technique

Details Attosecond electron spectroscopy using a novel interferometric pump-probe technique Attosecond electron spectroscopy using a novel interferometric pump-probe technique

2010-01-07

arxiv.org/abs/1001.1085v3

Phys. Rev. Lett. 105, 053001 (2010)

Physics

Atomic Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.105.053001

We present an interferometric pump-probe technique for the characterization of attosecond electron wave packets (WPs) that uses a free WP as a reference to measure a bound WP. We demonstrate our method by exciting helium atoms using an attosecond pulse with a bandwidth centered near the ionization threshold, thus creating both a bound and a free WP simultaneously. After a variable delay, the bound WP is ionized by a few-cycle infrared laser precisely synchronized to the original attosecond pulse. By measuring the delay-dependent photoelectron spectrum we obtain an interferogram that contains both quantum beats as well as multi-path interference. Analysis of the interferogram allows us to determine the bound WP components with a spectral resolution much better than the inverse of the attosecond pulse duration.

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