Direct time resolved observation of molecular dynamics induced by soft-x-ray photoionization

نویسندگان

  • Arvinder S Sandhu
  • Etienne Gagnon
  • Predrag Ranitovic
  • Xiao-Min Tong
  • C L Cocke
  • Margaret M Murnane
  • Henry C Kapteyn
چکیده

We report the first direct observation of ultrafast dynamics in molecules induced by ionizing radiation. We use high harmonic upconversion process to generate soft-x-ray pulses of few femtoseconds duration, which photoionize N2 molecule. This leads to the formation of highly excited N2 ions via inner-shell ionization and electron shakeup processes. We time resolve the unexplored fragmentation dynamics of the electron shakeup states with femtosecond resolution using a strong-field IR probe. The IR pulse promotes the dissociating N2 wavepacket to repulsive N2 potential. We obtain kinetic energy release of N/N channel as function of time delay and observe a rapid transition from spherically-symmetric molecular potential to a two-center potential within ~150 fs.

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تاریخ انتشار 2007