Implantação de um analisador de baixas energias de elétrons com resolução angular em um espectrômetro de perda de energia de elétrons

Abstract

This work describes the development, implementation and characterization of a Cylindrical Dispersive Analyzer 1270 on a Electron Energy Loss Spectrometer (EELS) operating in the region of impact energy from 10 to 200eV, which is being developed at the Laboratory of Atomic Spectroscopy and Molecular – LEAM UFJF. In the analyzer, several studies have also been developed to optimize the control circuit of the monochromatized electron gun of the EELS, which generated great stability, resulting in a considerable gain in intensity of the beam produced and improved handling. We describe the implementation of the angular variation of the turntable that supports the Cylindrical Dispersive Analyzer 1270, and the measure of variation, and also injection system of the gas through a beam cannula molybdenum electrically isolated, with vertical movement relative to disk where the monochromatized electron gun and the energy analyzer of electrons are installed. Performance tests of the spectrometer were made from the analysis of the energy resolution ΔE of the EELS. We obtained excellent results about transmission of the electron beam across the monochromatization region collision reaching the detection region of the spectrometer. We describe also an assessment of the improvements made in the Control Circuit of the Monochromatized Electron Gun, obtaining excellent results for the intensity of the electron beam in the energy range 0.1-100 eV.