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The sticking probability and surface coverage of ·methane, ethylene, and ethane molecules impinging on evaporated plutonium films have been measured. The sticking probability shows a rapid decrease from 0.2 to a nearly constant value of 0.01, until full coverage, when a rather rapid decrease occurs. The coverage varies from 14.5 X 10 molecules per square centimeter for methane, 8.8 X 10 14 molecules per square centimeter for ethylene, and 11.0 X 10 4 molecules per square centimeter for ethane. Possible bonding mechanisms are discussed.

ADSORPTION ON PLUTONIUM. PART II. THE LIGHT-WEIGHT HYDROCARBONS.