Phys. Rev. Lett. 105, 053001 (2010) [4 pages]Attosecond Electron Spectroscopy Using a Novel Interferometric Pump-Probe Technique
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 (AP) 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 AP. By measuring the delay-dependent photoelectron spectrum we obtain an interferogram that contains both quantum beats as well as multipath interference. Analysis of the interferogram allows us to determine the bound WP components with a spectral resolution much better than the inverse of the AP duration. This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. © 2010 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.105.053001
DOI:
10.1103/PhysRevLett.105.053001
PACS:
32.80.Rm, 32.80.Qk, 42.65.Ky
See AlsoSee Also: Luca Argenti and Eva Lindroth, Ionization Branching Ratio Control with a Resonance Attosecond Clock, Phys. Rev. Lett. 105, 053002 (2010). |
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