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Reaction surface approach to multimode vibronic coupling problems: general framework and application to furan.

E V Gromov1, V Sivaranjana Reddy1, F Gatti2

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|December 24, 2013
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A new framework simplifies complex molecular dynamics on potential energy surfaces. This method enables higher-dimensional quantum treatments, advancing the study of nonadiabatic photodynamics in molecules like furan.

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Area of Science:

  • Theoretical Chemistry
  • Quantum Dynamics
  • Photochemistry

Background:

  • Simulating molecular dynamics on intersecting potential energy surfaces is computationally challenging.
  • Accurate treatment of large-amplitude nuclear displacements is crucial for understanding photochemical processes.

Purpose of the Study:

  • To present a general theoretical framework for treating dynamics on intersecting multidimensional potential energy surfaces.
  • To enable higher-dimensional quantum mechanical treatments of molecular systems.

Main Methods:

  • Sub-division of nuclear coordinates into primary (large-amplitude) and secondary (small-amplitude) classes.
  • Application of a linear + quadratic vibronic coupling scheme with coordinate-dependent coefficients.
  • Incorporation of an effective-mode approach for environmental degrees of freedom.

Main Results:

  • Developed a novel general framework for molecular dynamics simulations.
  • Successfully applied the method to an eight-dimensional quantum treatment of furan's nonadiabatic photodynamics.
  • Achieved a higher dimensionality in quantum treatment than previously possible.

Conclusions:

  • The new framework offers a more tractable approach to complex molecular dynamics.
  • The study provides insights into the influence of various degrees of freedom on furan's nonadiabatic ring-opening dynamics and lifetime.