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Area of Science:

  • Chemical Physics
  • Quantum Chemistry
  • Molecular Dynamics

Background:

  • Photoionization of molecules can lead to complex electron-nuclear dynamics.
  • Understanding these dynamics is crucial for controlling chemical reactions and molecular behavior.
  • Toluene's cation presents a unique system due to a conical intersection between electronic states.

Purpose of the Study:

  • To investigate the nuclear dynamics following vertical ionization of toluene.
  • To elucidate the role of nonstationary electronic states in initiating molecular motion.
  • To explore dynamics initiated from a conical intersection region in toluene cation.

Main Methods:

  • Utilizing the Complete Active Space Self-Consistent Field (CASSCF) method.
  • Implementing the Ehrenfest method for theoretical simulations.
  • Simulating vertical ionization of toluene and tracking subsequent nuclear rearrangements.

Main Results:

  • The initial nuclear dynamics are strongly influenced by the character of the nonstationary electronic state formed post-ionization.
  • Ionization creating an equal superposition of the two lowest energy cation states drives nuclear motion in a distinct direction.
  • This orthogonal dynamics differs significantly from motion governed by individual ground or excited state potential energy surfaces.

Conclusions:

  • The electronic state resulting from photoionization is a key determinant of subsequent molecular dynamics.
  • Superposition states offer unique pathways for controlling molecular motion.
  • This research provides insights into ultrafast electron-nuclear coupling in aromatic molecules.