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Related Experiment Video

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Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

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Classical photodissociation dynamics with Bohr quantization.

¹Institut des Sciences Moléculaires, Université Bordeaux 1, 351 Cours de la Libération, 33405 Talence Cedex, France. l.bonnet@ism.u-bordeaux1.fr

The Journal of Chemical Physics

|November 9, 2010

Summary

A new classical expression for photodissociation cross sections is proposed. This method allows for more accurate classical simulations of molecular photodissociation, especially in the quantum regime.

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Area of Science:

Physical Chemistry
Chemical Physics
Computational Chemistry

Background:

Standard classical expressions for state-resolved photodissociation cross sections face limitations.
These limitations hinder efficient Bohr quantization of product internal motions.
Accurate classical simulations are crucial for understanding photodissociation dynamics.

Purpose of the Study:

To propose a novel, strictly equivalent classical expression for the state-resolved photodissociation cross section.
To overcome the limitations of existing expressions regarding Bohr quantization.
To enable more realistic classical simulations of photodissociation processes.

Main Methods:

Development of a new classical expression for the state-resolved photodissociation cross section.
Theoretical derivation demonstrating the equivalence to the standard expression.
Focus on applicability to direct polyatomic photodissociations.

Main Results:

The proposed expression is consistent with efficient Bohr quantization of product internal motions.
This new formulation resolves the inconsistency present in the standard classical approach.
The expression is suitable for classical simulations in the quantum regime with limited product states.

Conclusions:

The new classical expression provides a more accurate and consistent framework for simulating photodissociation.
This advancement facilitates realistic classical modeling of direct polyatomic photodissociations.
The findings are particularly relevant for systems where product states are sparsely populated.