The Transition to First-Order Kinetics

The probability, of a molecule s being atomized upon striking the metal surface is given by 

In Pigs. 2 and 3, the variation of the probability of atomization with pressure is shown for hydrogen over tungsten (11) and platinum (12), and for oxygen over platinum (12). It will be seen, now the temperature of the metal is very much greater, that there is a smooth transition from 

The transition from half-order to first-order kinetics for the atomization of oxygen over platinum at about 1750 K. 

The dependence of the rate of atomization on temperature for hydrogen over tungsten (0), platinum / ) and gold (Q), and for oxygen over platinum (Q) the data are imcorrected for filament and cooling. 

Numerical Valuetfor the Constanta of the Atomization Rate Equation exp - atoms cm- seo-i 

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