We use attosecond angular streaking to place an intensity-averaged upper limit of 12 attoseconds on the tunneling delay time in strong field ionization of helium. This is far shorter than most tunneling times discussed before.
© 2009 The Optical Society
(020.0020) Atomic and molecular physics : Atomic and molecular physics
(020.4180) Atomic and molecular physics : Multiphoton processes
(020.2649) Atomic and molecular physics : Strong field laser physics
A. N. Pfeiffer, P. Eckle, C. Cirelli, A. Staudte, R. Dörner, H. G. Muller, and U. Keller, "Laser Induced Tunneling in Less than 12 Attoseconds: Instantaneous or Invalid Concept?," in Conference on Lasers and Electro-Optics/International Quantum Electronics Conference, OSA Technical Digest (CD) (Optical Society of America, 2009), paper JThB1.
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