NARROW-BANDWIDTH HIGH-SENSITIVITY PHOTODETECTOR FOR REVERSE PHOTOELECTRON SPECTROSCOPY

摘要

PURPOSE: To enhance a resolution and sensitivity and also to improve the performance of the whole of equipment including an electron gun, by a method wherein a single-crystal CaF₂ window having a KCL thin film evaporated is provided in front of a photomultiplier of a photodetector and the KCl thin film is evaporated on the surface of a first dynode of the photomultiplier. ;CONSTITUTION: An electron beam 2 emitted from an electron gun 1 hits on a sample 3, a light 4 emitted from the sample 3 hits on a converging mirror 5 and it is converged thereby and projected to a photodetector 6. The light entering the photodetector 6 passes through a single-crystal CaF₂ window 8 covered with a KCL thin film 9. Combination of a first dynode 11 of a photomultiplier 7 whereon the KCI thin film 9 is evaporated with the KCL thin film 9 with which the single-crystal CaF₂ window 8 is covered functions as a low-cut filter, while the part of the single-crystal window 8 functions as a high-cut filter. According to this constitution, the rise of sensitivity is made sharp, the emission efficiency of a photoelectron is improved and also the sensitivity is enhanced.;COPYRIGHT: (C)1995,JPO