Ag19 cluster ions are mass selected and deposited on a Pt(111) surface covered by five monolayers of Kr. Almost monodispersed hexagonal shaped Ag islands are observed after Kr evaporation at 125 K. The identification of the island shape and the exact number of atoms has been successful by decorating the clusters with Kr atoms which can be counted by high resolution scanning tunneling microscopy.
Articles you may be interested inA new experimental setup for high-pressure catalytic activity measurements on surface deposited mass-selected Pt clusters Size selected cluster deposition on well characterized surfaces: Ag n / Pd (100) AIP Conf.We present an experimental setup for the investigation of the processes occurring during the deposition of mass-selected clusters on a well-defined surface. The sample is analyzed in situ by two complementary methods: thermal energy atom scattering ͑TEAS͒ and scanning tunneling microscopy ͑STM͒. TEAS is used to study the dynamical processes during the deposition and to gather statistical information about the resulting structures on the surface. Subsequent STM measurements allow us to investigate the collision outcome on an atomic scale. The setup is highly versatile and guarantees ultra-high-vacuum conditions and cryogenic temperatures ͑Ϸ30 K͒ of the sample at all times even during sample transfer. Clusters are produced in a CORDIS-type cluster source. A new compact multichannel effusive He source in combination with a new Wien-filter-based He detector are used for TEAS measurements. The new low-temperature STM allows measurements in a temperature range between 8 and 450 K. Atomic resolution on the Pt͑111͒ surface is regularly observed at T sample ϭ8 K. The performances of the setup are illustrated by STM images obtained after the deposition of Ag 7 ϩ clusters with E kin ϭ95 and 1000 eV on bare Pt͑111͒ and by measurements made of the deposition of Ag 7 ϩ clusters with E kin ϭ20 eV in a Xe-rare-gas matrix adsorbed on Pt͑111͒.
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