This is a Large Angle Convergent Beam Electron Diffraction
(LACBED) pattern observed along Si (111) zone axis. Convergent electron beam produces
such beautiful geometrical patterns formed by perfect atomic arrangement. Could
you call it a "CREST of material"?
At 58th photo contest hosted by the Japanese
Society of Electron Microscopy in 2002.
Condition
Specimen : Si single crystal
Instrument : Transmission Electron Microscope H-9000NAR
Accelerating voltage : 200 kV
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when the photo was taken.