Abstract
A study was made of the practical aspects of using an electron multiplier with a fast scanning 60° mass spectrometer. Two types of multiplier construction—the “Venetian Blind” and the “Box-and-grid” were used, and two types of dynode material—beryllium copper and silver magnesium. The performance of the multipliers was observed under various conditions, including baking and hydrocarbon contamination, and their subsequent effects on multiplier gain and noise. Methods of dynode reactivation were also investigated. It was found that the silver magnesium dynode, “Box-and-grid” constructed electron multiplier gave the best overall performance, and a multiplier was developed which had a stable gain with time, low background noise level, was unaffected by baking or hydrocarbon contamination under normal operating conditions and yet could be readily reactivated in situ if necessary.
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