0004168565 361..396 EM-Tec VS42 universal spring-loaded large vise holder for up to … Em Resolutions: Long Lasting Tungsten Filaments and LaB6 Cathodes for Electron Microscopy EM Resolutions manufacturers and suppliers of tools and accessories for users of electron … LaB6 Cathodes - APTech cold thermal Schottky. Interchangeability: Denka Model 3 LaB 6 … Crystallographic dependence of the work function and volatility of … However, its work function is lower than for a tungsten filament, so it is more efficient. Replacement filaments for Hitachi, JEOL and Zeiss electron microscopes. MIPAR Image Analysis. According to the thermionic results the work function for the LaB 6 crystal increases in the sequence (346) < (100) < (110) < (111) and ranges from 2.41 to 2.90 eV. vs tungsten TESCAN VEGA’s 4th generation Scanning Electron Microscope (SEM) with tungsten filament electron source combines SEM imaging and live … A tungsten filament heated by DC to approximately 2700K or LaB6 rod heated to around 2000K A vacuum of 10-3 Pa (10-4 Pa for LaB6) is needed to prevent oxidation of the filament Electrons “boil off” from the tip of the filament Electrons are accelerated by an acceleration voltage of 1-50kV - + Tungsten is normally used because it has the highest … Pin This Product. Field emission source is a fine, sharp, single crystal tungsten tip is employed.
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