Kinetic Energy of Methane Molecules Formed
from Methyl Radicals Adsorbed on Copper

M. U. Kislyuk, V. V. Savkin, and I. I. Tretyakov^†

Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, 117977 Russia

Received January 12, 2000

Abstract—The method of temperature-programmed reaction (TPR) with the spatial resolution of desorbed
product molecules and the measurements of their average rates ( are used to study the transformation of
methyl radicals adsorbed on polycrystalline copper. In the products of TPR, only methane is found. The spatial
distribution of its desorption flow (SDDF) is described by the equation C. The results of SDDF and
I/ I₀=cos¹⁶ measurements agree with each other. Under these conditions, translationally excited methane mol-
ecules are desorbed from the copper surface. The energy of these molecules is 10–15 times higher than the ther-
mal energy.

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