Finite temperature application of the corrected propagator method to reactive dynamics in a condensed-phase...

Area of Science:

• Quantum Chemistry
• Chemical Physics
• Computational Chemistry

Background:

• Complex systems require accurate quantum-classical methods.
• Existing methods struggle with finite temperature effects in dissipative baths.
• Proton transfer in condensed phases presents a significant computational challenge.

Purpose of the Study:

• To extend the mixed quantum-classical method to finite temperatures.
• To accurately simulate the quantum dynamics of a primary system coupled to a classical bath.
• To validate the method by calculating thermal rate constants for proton transfer.

Main Methods:

• Systematic correction of zeroth-order evolution rules.
• Frozen Gaussian approximation for bath degrees of freedom.
• Calculation of flux correlation functions and thermal rate constants.

Main Results:

• The extended mixed quantum-classical method accurately reproduces quantum dynamics at finite temperatures.
• Calculated thermal rate constants for proton transfer show good agreement with fully quantum methods.
• The method's accuracy is demonstrated across various coupling strengths and temperatures.

Conclusions:

• The extended mixed quantum-classical method is a powerful tool for studying quantum dynamics in condensed-phase systems at finite temperatures.
• This approach provides a computationally efficient and accurate alternative to fully quantum simulations.
• The method has significant implications for understanding chemical reaction mechanisms in complex environments.