Dressed adiabatic and diabatic potentials to study conical intersections for F + H2.

Area of Science:

• Theoretical Chemistry
• Chemical Physics
• Molecular Dynamics

Background:

• Understanding low-energy dynamics in molecular systems is crucial.
• Conical intersections (CI) significantly influence molecular reaction pathways.
• Dressed potentials offer an alternative perspective to bare potentials.

Purpose of the Study:

• To investigate the impact of conical intersections on molecular interactions.
• To compare the predictive power of dressed and bare adiabatic potentials for low-energy dynamics.
• To analyze the F + H2 reaction system as a case study.

Main Methods:

• Comparison of vibrational dressed adiabatic and vibrational dressed diabatic potentials.
• Analysis of potential barriers and van der Waals wells in the entrance channel.
• Theoretical modeling following Lipoff and Herschbach's suggestion.

Main Results:

• Dressed and bare potentials exhibit significant differences in barriers and wells.
• The effect of the (1, 2) conical intersection on the F + H2 reaction is found to be mild.
• Theoretical predictions are consistent with experimental data for this system.

Conclusions:

• Dressed potentials provide valuable insights into molecular reaction dynamics.
• Conical intersections have a less pronounced effect on the F + H2 reactive/exchange process than might be expected.
• The study validates the utility of comparing dressed and bare potentials for understanding molecular systems.