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Asymmetric Dissociative Tunneling Ionization of Tetrafluoromethane in ω − 2ω Intense Laser Fields

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  • Hiroka Hasegawa, Nagoya University
  • ,
  • Tiffany Walmsley, Nagoya University, University of Edinburgh
  • ,
  • Akitaka Matsuda, Nagoya University
  • ,
  • Toru Morishita, University of Electro-Communications
  • ,
  • Lars Bojer Madsen
  • Frank Jensen
  • Oleg I. Tolstikhin, Moscow Institute of Physics and Technology
  • ,
  • Akiyoshi Hishikawa, Nagoya University

Dissociative ionization of tetrafluoromethane (CF4) in linearly polarized ω-2ω ultrashort intense laser fields (1.4 × 1014 W/cm2, 800 and 400 nm) has been investigated by three-dimensional momentum ion imaging. The spatial distribution of (Formula presented.) produced by CF4 → (Formula presented.) + F + e exhibited a clear asymmetry with respect to the laser polarization direction. The degree of the asymmetry varies by the relative phase of the ω and 2ω laser fields, showing that 1) the breaking of the four equivalent C-F bonds can be manipulated by the laser pulse shape and 2) the C-F bond directed along the larger amplitude side of the ω-2ω electric fields tends to be broken. Weak-field asymptotic theory (WFAT) shows that the tunneling ionization from the 4t2 second highest-occupied molecular orbital (HOMO-1) surpasses that from the 1t1 HOMO. This predicts the enhancement of the tunneling ionization with electric fields pointing from F to C, in the direction opposite to that observed for the asymmetric fragment ejection. Possible mechanisms involved in the asymmetric dissociative ionization, such as post-ionization interactions, are discussed.

TidsskriftFrontiers in chemistry
Antal sider11
StatusUdgivet - apr. 2022

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