
Spatial Resolution
 Practical Electron Microscopy and Database 
 An Online Book 

http://www.globalsino.com/EM/

This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.

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Spatial resolution is defined as the smallest separation of two closelyplaced structures which still permits them to be distinguished as separate.
For an optical microscope, the spatial resolution is given by,
 [2711]
where,
η  The refractive index (e.g. = 1 for vacuum in EMs),
sinα  The numerical aperture,
λ  The wavelength of light. For instance, for violet lights with 380 nm wavelength, d_{0} is equal to 0.172 µm, while for electrons with 0.005 nm wavelength, d_{0} is about 0.003 nm.

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