A Possible Mechanistic Path to Explain Observed Second-Order Kinetics

Noting that concentration of surface A on a crystallite can be expressed as the number of surface atcms per volume 

Accmdingly, this sinqrle mechanistic treatment involving the formation of a surface dimer from migrating adatoms results in a form mathematically almost die same as for die GPLE. More conplex treatments involving simultaneous c ture and emission of two adatoms may lead to expressions diat are similar or idmtical to the GPLE. 

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A Possible Mechanistic Path to Explain Observed Second-Order Kinetics. - A single mechanistic treatment involving the fcnmation on a metal crystallite surface of a dimer fixMn two migrating adatoms of a species A leads to a second-rado expressirm having similarity to the sec(H)d-oider rate equation (Equation (4) where m = 2). The mechanism is depicted in Figure 15 and can be written as follows ... 

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