Abstract
We have developed a quartz-crystal microbalance (QCM) using a quartz tuning fork resonator, and have carried out experiments for Kr films adsorbed on a single crystalline graphite at LN2 temperature. For the monolayer film, the coupled mass to the oscillating substrate is significantly small until the film enters the commensurate (C) phase. It starts to increase at the C phase, and the increase in the coupled mass with respect to the coverage decreases at the coexistence phase between the C and the incommensurate (IC) phases. It is enhanced again when the film enters the IC phase. We compared the observed behavior with that of 5 MHz QCM experiments, and found that the sliding motion does not depend on oscillation frequency.
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