Abstract
The previously reported observed number of hydrogen-promoted field-evaporated platinum atoms at 21 K exhibited a maximum for the adsorption period of several milliseconds and a decreased constant number for a longer adsorption period. The effects of temperature and residual tip voltage during an adsorption period are described. An unexpected finding is a maximum number of evaporated atoms at a residual tip voltage of 20%∼30% of the helium best image voltage and a decreased number at 40%∼60%. The coincidence between the hydrogen image voltage, the tip voltage at which H3+ occurs, and the residual tip voltage at which the number of evaporated atoms decreases, is mentioned.
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