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A method of the in-situ measurements of electrode work functions in argon gas tungsten arc during operation is presented. This technique is based on the photoelectric effect at the surface of tungsten cathode by using the pulse laser system consisting of a Nd-YAG laser and a dye laser. Four types of tungsten electrode, namely, pure W, W-0.5% La 2 O 3 , W-1% La 2 O 3 ...
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