1. Phase measurement of a Fano window resonance using tunable attosecond pulses
- Author
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Kotur, M., Guenot, D., Jimenez-Galan, A., Kroon, D., Larsen, E. W., Louisy, M., Bengtsson, S., Miranda, M., Mauritsson, J., Arnold, C. L., Canton, S. E., Gisselbrecht, M., Carette, T., Dahlstrom, J. M., Lindroth, E., Maquet, A., Argenti, L., Martin, F., and L'Huillier, A.
- Subjects
Physics - Atomic Physics - 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., Comment: 5 pages, 4 figures
- Published
- 2015
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