Atomic Observation of the Sublimation Process of the Pb(111) Surface

T. Tanigaki, H. Suzuki, Y. Kimura, C. Kaito and Y. Saito
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T. Tanigaki: Department of Nanophysics in Frontier Projects, Ritsumeikan University, Shiga 525-8577, Japan
H. Suzuki: Department of Nanophysics in Frontier Projects, Ritsumeikan University, Shiga 525-8577, Japan
Y. Kimura: Department of Nanophysics in Frontier Projects, Ritsumeikan University, Shiga 525-8577, Japan
C. Kaito: Department of Nanophysics in Frontier Projects, Ritsumeikan University, Shiga 525-8577, Japan
Y. Saito: Department of Electron and Information Science, Kyoto Institute of Technology, Kyoto 606-8585, Japan

Surface Review and Letters (SRL), 2003, vol. 10, issue 02n03, 455-459

Abstract: The dynamic behavior of the sublimation process using ultrafine Pb particles produced by the gas evaporation technique was examined at the level of atomic resolution using a transmission electron microscope equipped with a real-time video-recording system. The ultrafine Pb particles coated with a carbon layer with a thickness of the order of 5 nm were prepared in the electron microscope by heating particles on carbon film at 300°C. Sublimation of the Pb particle covered with the carbon layer took place above 470°C, which is slightly higher than the melting point of Pb. Sublimation occurred at the surface with a higher surface energy. The sublimation process of the (111) surface was clearly observed at an atomic level. It was found that two- or four-atomic-layer step flow was observed at the (111) surface. At the (111) surface between the stacking faults, two-layer and successive one-layer sublimation occurred.

Date: 2003
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DOI: 10.1142/S0218625X03005220

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