Subcycle ac Stark Shift of Helium Excited States Probed with Isolated Attosecond Pulses

    Authors

    M. Chini; B. Z. Zhao; H. Wang; Y. Cheng; S. X. Hu;Z. H. Chang

    Comments

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    Abbreviated Journal Title

    Phys. Rev. Lett.

    Keywords

    FIELD; Physics, Multidisciplinary

    Abstract

    Recent advances in attosecond science have relied upon the nearly instantaneous response of free electrons to an external field. However, it is still not clear whether bound electrons are able to rearrange on sublaser cycle time scales. Here, we probe the optical Stark shifts induced by a few-cycle near infrared laser field in helium bound states using isolated attosecond pulses in a transient absorption scheme and uncover a subcycle laser-induced energy level shift of the laser-dressed 1s3p state.

    Journal Title

    Physical Review Letters

    Volume

    109

    Issue/Number

    7

    Publication Date

    1-1-2012

    Document Type

    Article

    Language

    English

    First Page

    4

    WOS Identifier

    WOS:000307709400019

    ISSN

    0031-9007

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