Abstract

The H 2 adsorption properties of ultrathin Pd films deposited on Mo(100) have been studied with Auger electron spectroscopy (AES) and temperature-programmed desorption (TPD). The pseudomorphic monolayer of Pd on Mo(100) has a greatly reduced H 2 uptake capacity at 150 K compared to bulk Pd. Desorption from the Pd monolayer occurs from a chemisorption state with a desorption temperature of about 290 K. Thicker Pd films also have a reduced H 2 uptake, until θ Pd≥5.5. H 2 desorption from the low-temperature hydride state that is characteristic of bulk Pd only occurs for Pd films with θ Pd≥5.5.

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