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arXiv · 1505.02024

Phase measurement of a Fano window resonance using tunable attosecond pulses

M. Kotur·D. Guenot·A. Jimenez-Galan·D. Kroon·E. W. Larsen·M. Louisy·S. Bengtsson·M. Miranda·J. Mauritsson·C. L. Arnold·S. E. Canton·M. Gisselbrecht·T. Carette·J. M. Dahlstrom·E. Lindroth·A. Maquet·L. Argenti·F. Martin·A. L'Huillier
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Abstract

We study the photoionization of argon atoms close to the 3s$^2$3p$^6$ $\rightarrow$ 3s$^1$3p$^6$4p $\leftrightarrow$ 3s$^2$3p$^5$ $\varepsilon \ell$, $\ell$=s,d Fano window resonance. An interferometric technique using an attosecond pulse train, i.e. a frequency comb in the extreme ultraviolet range, and a weak infrared probe field allows us to study both amplitude and phase of the photoionization probability amplitude as a function of photon energy. A theoretical calculation of the ionization process accounting for several continuum channels and bandwidth effects reproduces well the experimental observations and shows that the phase variation of the resonant two-photon amplitude depends on the interaction between the channels involved in the autoionization process.

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M. Kotur, D. Guenot, A. Jimenez-Galan, D. Kroon, E. W. Larsen, M. Louisy, S. Bengtsson, M. Miranda, J. Mauritsson, C. L. Arnold, S. E. Canton, M. Gisselbrecht, T. Carette, J. M. Dahlstrom, E. Lindroth, A. Maquet, L. Argenti, F. Martin, A. L'Huillier. 2015-05-08. Phase measurement of a Fano window resonance using tunable attosecond pulses. https://doi.org/10.1038/ncomms10566

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