MICROSCOPE REVIEWER -1.pdf

Types: Types of Microscopes Tungsten Filament Source - consists of a heated tungsten wire (~100 µm long). It Scanning Electron Microscope...

Types: Types of Microscopes Tungsten Filament Source - consists of a heated tungsten wire (~100 µm long). It Scanning Electron Microscope offers a basic, cost-effective option with (SEM) lower resolution. However, frequent maintenance is needed due to thermal sensitivity and burnout. Lanthanum Hexaboride (LaB6) and Cerium Hexaboride (CeB6) - use precision-polished hexaboride crystals for thermionic emission, providing higher resolution and brightness with better stability and longer lifetime. CeB6 has an extended lifetime and better resistance to evaporation compared to LaB6. Field Emission Gun (FEG) - employs a Used to obtain high resolution tungsten wire with a sharp tip (