What question did this study set out to answer?

The aim is to present a practical understanding of RRKM theory, its simplified multi-well version AWATAR, and the modelling of radiative processes.

May 6, 2026Physical Chemistry Chemical Physics0 citationsOpen Access

A Practical Guide to RRKM Theory, its Simplified Multi-Well Version AWATAR and Master Equation Modelling of Radiative Processes

MSMagdalena SalzburgerUniversität Innsbruck MRMarc ReimannUniversität Innsbruck JHJessica C. HartmannUniversität Innsbruck

Key Points

The aim is to present a practical understanding of RRKM theory, its simplified multi-well version AWATAR, and the modelling of radiative processes.
Details on applying RRKM theory and AWATAR in gas phase reactions
Insights on modelling radiative processes using the master equation
Discussion on the limitations of equilibrium thermodynamics in ultra-high vacuum conditions
Improved understanding of unimolecular reaction behaviour in the absence of traditional heat baths
Highlighting the role of radiative thermalization in reaction kinetics
Establishment of AWATAR as a useful tool in modelling

Abstract

Unimolecular reactions and rearrangements in the gas phase under ultra-high vacuum conditions are not correctly described with equilibrium thermodynamics, since the heat bath is missing, and radiative thermalization is slow...

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