Collisional O₂ + N₂ State-Selected Cross Sections for Open Science Cloud Reuse.

Area of Science:

• Chemical Kinetics
• Computational Chemistry
• Atmospheric Chemistry

Background:

• Accurate calculation of collision rates is essential for understanding chemical reactions, especially at high temperatures.
• Previous studies often assumed thermal rotational distributions, potentially oversimplifying complex collision dynamics.

Purpose of the Study:

• To investigate the internal energy state specificity of dissociative O2 + N2 collision rates.
• To compare rotationally state-selected rates with those assuming a thermal rotational distribution.
• To identify key molecular properties for modeling dissociation processes.

Main Methods:

• Quasi-classical trajectory calculations on an accurate potential energy surface (PES).
• Explicit consideration of reactant rotational states.
• Analysis of state-specific and state-to-state cross sections.
• Use of reduced dimensionality representations of the PES.

Main Results:

• Significant deviations observed between rotationally state-selected and rotationally thermalized collision rates.
• Identification of a bond-order-like process coordinate for modeling dissociation.
• Demonstration of the PES's influence on state-specific collision dynamics.

Conclusions:

• Internal energy state specificity plays a critical role in O2 + N2 collision rates at high temperatures.
• A bond-order-like coordinate can effectively model detailed dissociation cross sections.
• Findings support data structuring for collaborative chemical knowledge management.