Nested Polyhedra of MX2 (M = W, Mo; X = S, Se) Probed by High-Resolution Electron Microscopy and Scanning Tunneling Microscopy

1994 ◽  
Vol 116 (5) ◽  
pp. 1914-1917 ◽  
Author(s):  
M. Hershfinkel ◽  
L. A. Gheber ◽  
V. Volterra ◽  
J. L. Hutchison ◽  
L. Margulis ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Scanning Tunneling Microscopy ◽  
High Resolution Electron Microscopy ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Resolution Electron

1/60 Sec Time-Resolved High-Resolution Electron Microscopy of Step-Diffusion of Tungsten Atoms on MgO (001) Surfaces

1996 ◽  
Vol 54 ◽  
pp. 380-381
Author(s):  
N. Tanaka ◽  
H. Kimata ◽  
T. Kizuka
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Diffusion Process ◽  
Time Resolution ◽  
Film Growth ◽  
High Resolution Electron Microscopy ◽  
Scanning Tunneling ◽  
Video Tape ◽  
Exponential Factor ◽  
Resolution Electron

Surface-diffusion process of atoms is one of the important factors for understanding various types of surface-related phenomena such as thin-film growth and catalysis reaction[l]. Development of field ion microscope (FIM) was a great breakthrough for the study of the process in atomic level. The diffusion process of Rh and Re atoms on tungsten surfaces was quantitatively studied, and the barrier potential (Ed) and the pre-exponential factor (D0) were successfully determined[2]. Recent development of scanning tunneling microscope (STM) has also enabled us to measure directly the moving of Pb and Sb-atoms on Ge and Si (111) surfaces[3, 4]. The time-resolution of these methods is, however, not sufficient to trace the diffusion process in detail.In previous papers, we reported the first experiment of tracing the diffusion process of tungsten(W)-atoms on terrace-regions of MgO (001) surfaces in the time-resolution of 1/60 s.using dynamic high resolution electron microscopy[5,6]. The values Ed=0.18 eV and Do=1.5x10−14 cm2/s were successfully determined from the video-tape images. In the present study, we have observed diffusing atoms along the surface-steps and studied the phenomena quantitatively.

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