Electric-field-induced dissociation of heavy Rydberg ion-pair states

Area of Science:

• Atomic and Molecular Physics
• Quantum Chemistry
• Computational Chemistry

Background:

• Ion-pair states are crucial in understanding molecular dissociation dynamics.
• Ramped electric fields are experimentally employed to probe and detect these ion-pair states.
• Accurate theoretical models are needed to interpret experimental observations of field-induced dissociation.

Purpose of the Study:

• To simulate the dissociation of heavy Rydberg ion pairs (H+⋅⋅⋅F− and K+⋅⋅⋅Cl−) using a classical trajectory Monte Carlo approach.
• To investigate the influence of electric fields on ion-pair dissociation dynamics.
• To validate the quasi-classical model against experimental results for ramped field-induced dissociation.

Main Methods:

• Utilized a classical trajectory Monte Carlo (CTMC) method for simulations.
• Incorporated strong short-range repulsive interactions in ion-pair scattering.
• Simulated dissociation under ramped electric fields.

Main Results:

• Simulations showed good agreement with experimental data for Stark wavepackets.
• The quasi-classical model effectively describes characteristics of field-induced dissociation.
• Dissociation fields vary broadly, depending on initial orbital angular momentum and state orientation.

Conclusions:

• The CTMC approach, including short-range repulsion, accurately predicts ion-pair dissociation dynamics.
• Quasi-classical modeling is a reliable tool for studying field-induced dissociation phenomena.
• Initial state properties significantly influence the electric field strength required for dissociation.