scanning electron microscopy katedra experimentálnej fyziky fmfi uk b r a t i s l a v a
TRANSCRIPT
Scanning electron microscopy
Katedra experimentálnej fyziky
FMFI UK
B r a t i s l a v a
History
• 1897 - Discovery of the electron ( J. J. Thompson)• 1924 - Particle and wave theory (L. deBroglie)• 1926 - Electromagnetic lens (H. Busch)• 1927 - Demonstration of electron diffraction (C. J.
Davisson and L. H. Germer)• 1929 - Theoretical description of SEM (H. Stintzing)• 1932 - Construction of first electron microscope
(transmission) (M. Knoll and E. Ruska)• 1935 - Demonstration of scanning electron
microscope theory (M. Knoll)• 1938 - First SEM constructed (M. von Ardenne)• 1939 - First commercial transmission electron
microscope (B. von Borries and E. Ruska)
History
• 1942 - Production of electrostatic lens SEM (V. K. Zworykin, J. Hillier and R. L. Synder)
• 1956 - Production of electromagnetic lens SEM (K. C. A. Smith)
• 1956 - X-ray microanalyzer with a scanning probe (V. E. Cosslett and P. Duncomb)
• 1960 - Improved secondary electron detector (T. E. Everhart and R. F. M. Thornley)
• 1960's - First commercial SEM (Cambridge Instrument Co., Ltd.)
• 1971 - Construction of a STEM with a field emission source (A. V. Crewe and J. Wall)
Physics
• Electron interaction with sample
• Electron energy spectrum
• Electron – core electron interaction
Electron interaction with sample
Electron energy spectrum
Electron – core electron interaction
Technics
• Vacuum chamber
• Electron optics
• Image formation
• Electronics
Tubus VEGA
Electron gun
Cathode
Electromagnetic lens
Detectors
Image formation
Image modes
Image modes
Image modes
SEM – VEGA TS5136MM
Image Gallery
• Poppy seed
Image Gallery
• Leaf of nettle with beetle
Image Gallery
• Fly head
Image Gallery
• Ant head
Image Gallery
• Ant feeler