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- W2022365570 abstract "The kinetics of the initial fast adsorption of carbon monoxide and hydrogen on evaporated nickel films has been investigated by a flow method. The ultimate vacuum obtained is 1×10-9 mmHg and the surface of the film can be kept clean during and after evaporation. There are two distinct differences in the rate of chemisorption between carbon monoxide and hydrogen. The sticking probability of carbon monoxide is estimated to be nearly 1 at 0°C on clean surface and remains constant until the surface is covered to some extent. With hydrogen, however, it is about 0.1 at the same condition, and begins to decrease at a lower coverage.Applying the potential energy diagram proposed by Lennard-Jones to the above systems, the difference in the initial value of sticking probability is explained as due to the difference in type of chemisorption, i.e., carbon monoxide chemisorbs without dissociation, whereas hydrogen does with dissociation. The difference in the decrease of sticking probability with adsorption is considered to be due to the difference in mobility of adsorbate on the surface ; at room temperature surface migration is easy for hydrogen, but not for carbon monoxide. The chemisorption model proposed here can be extended to the slow adsorption of carbon monoxide previously reported." @default.
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- W2022365570 date "1957-01-01" @default.
- W2022365570 modified "2023-10-18" @default.
- W2022365570 title "ADSORPTION OF GASES ON EVAPORATED NICKEL FILM IN AN ULTRA-HIGH VACUUM SYSTEM" @default.
- W2022365570 doi "https://doi.org/10.3131/jvsj1950.8.35" @default.
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