Calculating initial-state-selected reaction probabilities from thermal flux eigenstates: a transition-state-based...

Area of Science:

• Quantum Chemistry
• Chemical Reaction Dynamics
• Computational Spectroscopy

Background:

• Calculating state-selected reaction probabilities is crucial for understanding chemical reaction mechanisms.
• Traditional methods often face computational challenges for complex systems.

Purpose of the Study:

• To present a novel computational approach for determining initial-state-selected reaction probabilities.
• To validate the method using a benchmark chemical reaction.

Main Methods:

• Utilizing a transition-state view combined with the multiconfigurational time-dependent Hartree (MCTDH) approach.
• Employing flux correlation functions to construct and propagate wave packets.
• Obtaining a complete set of reaction probabilities from thermal flux eigenstates.

Main Results:

• The developed approach successfully calculates initial-state-selected reaction probabilities.
• The method demonstrates reliability when tested on the H+H(2) (J=0) reaction.
• Concepts from calculating rate constants (k(T)) and density of states (N(E)) are adapted for state-selected probabilities.

Conclusions:

• The presented method offers an accurate and efficient way to compute state-selected reaction probabilities.
• This approach advances the theoretical understanding of chemical reaction dynamics.
• It provides a robust tool for theoretical investigations in physical chemistry.