Nuclear conversion theory: molecular hydrogen in non-magnetic insulators

Area of Science:

• Surface Science
• Catalysis
• Quantum Mechanics

Background:

• Hydrogen conversion on non-magnetic solids is influenced by intermediate spin states.
• Symmetry-breaking interactions, including electron spin-orbit coupling, are crucial.
• Existing models require expansion to include charge-transfer and band states.

Purpose of the Study:

• To investigate hydrogen conversion patterns on non-magnetic solids.
• To model the influence of electron spin-orbit coupling and electron repulsion on catalytic intermediates.
• To develop a criterion for selecting efficient conversion channels.

Main Methods:

• Developed a theoretical model incorporating electron spin-orbit coupling, electron repulsion, and hyperfine interactions.
• Extended the electron basis to include charge-transfer and continuum band states.
• Analyzed 'electronic' and 'nuclear' conversion pathways.

Main Results:

• Proposed a criterion based on spin-orbit coupling strength to identify efficient conversion channels.
• Demonstrated that broadening of antibonding molecular excited states by the solid conduction band facilitates hydrogen conversion.
• Related conversion rates to material parameters like gap width and ionization potentials.

Conclusions:

• The study provides a comprehensive model for hydrogen conversion on solids, accounting for key quantum mechanical interactions.
• The findings offer a method to predict and optimize hydrogen conversion efficiency based on solid-state properties.
• The model's predictions align with experimental observations, validating its approach.