Resonances in three-photon double ionization of Ar in intense extreme-ultraviolet free-electron laser fields studied by shot-by-shot photoelectron spectroscopy

Y. Hikosaka; M. Fushitani; A. Matsuda; T. Endo; Y. Toida; E. Shigemasa; M. Nagasono; K. Tono; T. Togashi; M. Yabashi; T. Ishikawa; A. Hishikawa

doi:10.1103/PhysRevA.88.023421

Resonances in three-photon double ionization of Ar in intense extreme-ultraviolet free-electron laser fields studied by shot-by-shot photoelectron spectroscopy

Y. Hikosaka^*, M. Fushitani, A. Matsuda, T. Endo, Y. Toida, E. Shigemasa, M. Nagasono, K. Tono, T. Togashi, M. Yabashi, T. Ishikawa, A. Hishikawa

^*Corresponding author for this work

Faculty of Liberal Arts and Sciences

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Abstract

Shot-by-shot photoelectron spectroscopy has been performed to study the three-photon double ionization of Ar in intense extreme-ultraviolet free-electron laser fields over a photon energy range of 19.6-22.0 eV. It is found that the double ionization to Ar2⁺ 3p^-2 proceeds sequentially via the formation of singly charged Ar⁺ 3p^-1 states and is enhanced around photon energies of 20.5 and 21.5 eV. Two types of resonance are identified in the two-photon ionization of the Ar⁺ 3p^-1 states: (i) resonances to intermediate states at the one-photon energy level and (ii) those to autoionizing states above the Ar⁺ ionization threshold.

Original language	English
Article number	023421
Journal	Physical Review A - Atomic, Molecular, and Optical Physics
Volume	88
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevA.88.023421
State	Published - 2013/08/23

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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Hikosaka, Y., Fushitani, M., Matsuda, A., Endo, T., Toida, Y., Shigemasa, E., Nagasono, M., Tono, K., Togashi, T., Yabashi, M., Ishikawa, T., & Hishikawa, A. (2013). Resonances in three-photon double ionization of Ar in intense extreme-ultraviolet free-electron laser fields studied by shot-by-shot photoelectron spectroscopy. Physical Review A - Atomic, Molecular, and Optical Physics, 88(2), Article 023421. https://doi.org/10.1103/PhysRevA.88.023421

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title = "Resonances in three-photon double ionization of Ar in intense extreme-ultraviolet free-electron laser fields studied by shot-by-shot photoelectron spectroscopy",

abstract = "Shot-by-shot photoelectron spectroscopy has been performed to study the three-photon double ionization of Ar in intense extreme-ultraviolet free-electron laser fields over a photon energy range of 19.6-22.0 eV. It is found that the double ionization to Ar2+ 3p-2 proceeds sequentially via the formation of singly charged Ar+ 3p-1 states and is enhanced around photon energies of 20.5 and 21.5 eV. Two types of resonance are identified in the two-photon ionization of the Ar+ 3p-1 states: (i) resonances to intermediate states at the one-photon energy level and (ii) those to autoionizing states above the Ar+ ionization threshold.",

author = "Y. Hikosaka and M. Fushitani and A. Matsuda and T. Endo and Y. Toida and E. Shigemasa and M. Nagasono and K. Tono and T. Togashi and M. Yabashi and T. Ishikawa and A. Hishikawa",

year = "2013",

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day = "23",

doi = "10.1103/PhysRevA.88.023421",

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Hikosaka, Y, Fushitani, M, Matsuda, A, Endo, T, Toida, Y, Shigemasa, E, Nagasono, M, Tono, K, Togashi, T, Yabashi, M, Ishikawa, T & Hishikawa, A 2013, 'Resonances in three-photon double ionization of Ar in intense extreme-ultraviolet free-electron laser fields studied by shot-by-shot photoelectron spectroscopy', Physical Review A - Atomic, Molecular, and Optical Physics, vol. 88, no. 2, 023421. https://doi.org/10.1103/PhysRevA.88.023421

Resonances in three-photon double ionization of Ar in intense extreme-ultraviolet free-electron laser fields studied by shot-by-shot photoelectron spectroscopy. / Hikosaka, Y.; Fushitani, M.; Matsuda, A. et al.
In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 88, No. 2, 023421, 23.08.2013.

Research output: Contribution to journal › Article › peer-review

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T1 - Resonances in three-photon double ionization of Ar in intense extreme-ultraviolet free-electron laser fields studied by shot-by-shot photoelectron spectroscopy

AU - Hikosaka, Y.

AU - Fushitani, M.

AU - Matsuda, A.

AU - Endo, T.

AU - Toida, Y.

AU - Shigemasa, E.

AU - Nagasono, M.

AU - Tono, K.

AU - Togashi, T.

AU - Yabashi, M.

AU - Ishikawa, T.

AU - Hishikawa, A.

PY - 2013/8/23

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N2 - Shot-by-shot photoelectron spectroscopy has been performed to study the three-photon double ionization of Ar in intense extreme-ultraviolet free-electron laser fields over a photon energy range of 19.6-22.0 eV. It is found that the double ionization to Ar2+ 3p-2 proceeds sequentially via the formation of singly charged Ar+ 3p-1 states and is enhanced around photon energies of 20.5 and 21.5 eV. Two types of resonance are identified in the two-photon ionization of the Ar+ 3p-1 states: (i) resonances to intermediate states at the one-photon energy level and (ii) those to autoionizing states above the Ar+ ionization threshold.

AB - Shot-by-shot photoelectron spectroscopy has been performed to study the three-photon double ionization of Ar in intense extreme-ultraviolet free-electron laser fields over a photon energy range of 19.6-22.0 eV. It is found that the double ionization to Ar2+ 3p-2 proceeds sequentially via the formation of singly charged Ar+ 3p-1 states and is enhanced around photon energies of 20.5 and 21.5 eV. Two types of resonance are identified in the two-photon ionization of the Ar+ 3p-1 states: (i) resonances to intermediate states at the one-photon energy level and (ii) those to autoionizing states above the Ar+ ionization threshold.

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Resonances in three-photon double ionization of Ar in intense extreme-ultraviolet free-electron laser fields studied by shot-by-shot photoelectron spectroscopy

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