Reversible exciplex formation followed charge separation

Area of Science:

• Photochemistry
• Chemical Kinetics
• Physical Chemistry

Background:

• Exciplex formation and ion pair decomposition are key processes in photochemistry.
• Understanding geminate and bulk ion recombination is crucial for predicting product yields.

Purpose of the Study:

• To develop a kinetic model for exciplex formation, ion pair decomposition, and subsequent recombination.
• To determine quantum yields and product distributions under pulse and stationary excitation.

Main Methods:

• Derivation of integral kinetic equations for state populations.
• Modeling spin conversion via incoherent (rate) mechanisms.
• Incorporating contact electron transfer and heavy particle reactions.

Main Results:

• Solutions derived for integral equations, expressed via reaction constants and diffusion characteristics.
• Calculated quantum yields for excited states and exciplex fluorescence.
• Determined yields of free ions and triplet products under pulse excitation, and stationary concentrations under continuous pumping.

Conclusions:

• The developed model accurately describes the complex reaction pathways.
• Provides a framework for predicting photochemical outcomes based on fundamental reaction parameters.