FIELD: equipment for X-ray electron spectroscopy. SUBSTANCE: device has jacket, under which anode, cathode, screen and additional electrode are located. New feature of X-ray tube is guidance of cathode electrons, which are directed by electrostatic field to side bulge with maximal height of 1.5-2 mm which is designed as triangular prism with edge, which is concave by height, which is less than maximal height of bulge. Electrons are arranged along complete length of edge. EFFECT: increased intensity of characteristic radiation directed to sample. 1 dwg
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