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Physical Chemistry 3: — Chemical Kinetics — - Christian-Albrechts ...

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8.2 Lindemann mechanism 178<br />

8.2 Lindemann mechanism<br />

First attempts to explain the pressure dependence of unimolecular reaction rate constants<br />

due to radiation and the dissociation dynamics due to centrifugal forces (rotational<br />

excitation) proved to be wrong. In addition, the historic examples for unimolecular reactions,<br />

for instance the N 2 O 5 decomposition, were later proven to have more complex<br />

reaction mechanisms. The first “realistic” model that explained the pressure dependence<br />

of was that proposed by Lindemann (1922).<br />

I<br />

Figure 8.4: Lindemann mechanism.<br />

I<br />

Figure 8.5: Lindemann mechanism: High pressure regime.

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