Abstract
When a substance is heated, the kinetic energy of atoms and molecules increases. E.g., if methane is heated, the kinetic energy of translation, vibration and rotation of methane molecules increases, as discussed in section 1.2. As heat is applied, higher vibrational states are increasingly populated. In higher vibrational quantum states, the average C-H bond distance increases until finally the C-H bond breaks. The result is the formation of a methyl radical and a hydrogen atom.
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Ašperger, S. (2003). Reactions of Free Radicals. In: Chemical Kinetics and Inorganic Reaction Mechanisms. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-9276-5_7
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