Theory of electron attachment to CO2 clusters

Area of Science:

• Physical Chemistry
• Atomic and Molecular Physics
• Quantum Mechanics

Background:

• Electron collisions with molecular clusters are crucial for understanding chemical reactions in condensed phases.
• Vibrational Feshbach resonances (VFRs) have been recently observed in electron attachment to carbon dioxide (CO2) clusters.
• The theoretical description of electron-molecule interactions within clusters is complex.

Purpose of the Study:

• To develop a theoretical framework for describing electron collisions with van der Waals clusters.
• To explain the mechanism behind recently observed vibrational Feshbach resonances (VFRs) in electron attachment to CO2 clusters.
• To investigate the influence of VFRs on vibrational excitation (VE) processes in molecular clusters.

Main Methods:

• Development of a quantum mechanical theory for electron scattering from van der Waals clusters.
• Computational modeling of electron attachment to CO2 clusters.
• Calculation of cross sections for vibrational excitation (VE) and resonant electron attachment.

Main Results:

• The developed theory successfully describes vibrational Feshbach resonances (VFRs) in electron attachment to CO2 clusters.
• The calculations predict vibrational excitation (VE) of individual molecular units within the cluster.
• A significant influence of VFRs on the vibrational excitation (VE) cross sections was demonstrated.

Conclusions:

• The new theory provides a robust explanation for VFRs in electron-cluster interactions.
• Vibrational Feshbach resonances play a critical role in the dynamics of electron-molecule interactions within clusters.
• Understanding these resonances is key to predicting electron-induced chemistry in condensed CO2.