Experimental Evidence of a Roughening Transition in Adsorbed Xenon Multilayers

Abstract
In this Letter evidence is provided for a roughening transition in adsorbed xenon multilayers on palladium. The layer-distinctive Xe 5p photoemission is used to measure adsorption isotherms as well as the relative equilibrium population of individual Xe layers. Below the roughening temperature TR xenon adsorbs layer by layer. Above TR simultaneous population of different layers takes place.