Proton Transfer Studied Using a Combined Ab Initio Reactive Potential Energy Surface with Quantum Path Integral...

Area of Science:

• Chemical Dynamics
• Quantum Chemistry
• Theoretical Chemistry

Background:

• Intramolecular proton transfer is a fundamental chemical process.
• Accurate theoretical models are needed to understand reaction dynamics.
• Previous methods often lacked full-dimensional accuracy.

Purpose of the Study:

• To calculate intramolecular proton transfer rates accurately.
• To compare different quantum dynamical methods.
• To develop a chemically accurate theoretical framework.

Main Methods:

• Full-dimensional potential energy surface using ab initio calculations.
• Classical Transition State Theory.
• Path-Integral Quantum Transition State Theory (PI-QTST).
• Quantum Instanton (QI) approach.

Main Results:

• Calculated proton transfer rates for malonaldehyde.
• PI-QTST and QI methods show agreement in kinetic isotope effect estimates.
• Demonstrated a practical framework for quantized reactive dynamics.

Conclusions:

• Advanced quantum methods provide accurate predictions for proton transfer.
• The developed framework is suitable for complex chemical reactions.
• Further improvements can enhance the scope of these calculations.