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Updated: Jan 19, 2026

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Vibronic coupling in the F·CH4 prereactive complex.

Daniela Schäpers1, Uwe Manthe1

  • 1Theoretische Chemie, Fakultät für Chemie, Universität Bielefeld, Universitätsstr. 25, D-33615 Bielefeld, Germany.

The Journal of Chemical Physics
|September 16, 2019
PubMed
Summary
This summary is machine-generated.

Investigating the F·CH4 complex, this study reveals chaotic dynamics due to vibronic coupling. Nonadiabatic transitions impact resonances but have minor effects on averaged properties like spectra.

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Area of Science:

  • Chemical Dynamics
  • Quantum Chemistry
  • Reaction Mechanisms

Background:

  • The F + CH4 reaction exhibits complex mode-selective chemistry and resonances.
  • The prereactive F·CH4 complex is crucial for understanding reaction dynamics.

Purpose of the Study:

  • To investigate the influence of nonadiabatic transitions and geometric phase on F·CH4 complex quasibound states.
  • To extend previous studies by including vibronic coupling effects.

Main Methods:

  • Quantum dynamics calculations using the multiconfigurational time-dependent Hartree (MCTDH) approach.
  • Accurate accounting for vibronic and spin-orbit coupling.

Main Results:

  • Inclusion of vibronic coupling leads to chaotic dynamics in the F·CH4 complex, contrasting with previous findings of free rotation.
  • Nonadiabatic transitions significantly alter individual resonances.
  • The impact of nonadiabatic transitions on averaged quantum state densities and photodetachment spectra is minimal.

Conclusions:

  • Vibronic coupling introduces significant complexity to the F·CH4 complex dynamics.
  • While nonadiabatic effects are important for specific resonances, their overall influence on bulk properties is limited.