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Table 1 Incident electron energy partition of different materials, and the empirical formula for the best SEE and thickness of the material

From: The Design of the Emission Layer for Electron Multipliers

Incident electron energy partition Al2O3 (eV) MgO (eV) Al2O3/MgO (eV) MgO/Al2O3 (eV)
Low [0, 250] [0, 500] [0, 500] [0, 300]
Medium [250, 500] [500, 1000] [500, 1000] [500, 1000]
High [500, 1500] [1000, 1500] [1000, 1500] [500, 1500]
Best SEE formula 3.99 − 205 * ethickness/1.73 9.56 – 8.64  * ethickness/7.39 7.94 – 1.21   * ethickness/1.03 4.69 + 3.64 * ethickness/2.11