Abstract
A simple modification to the spark shield of the ion source of a spark source mass spectrograph is discussed. This helps to maintain a low partial pressure of residual gases during sparking of reactive materials. A grid is placed over the viewing slit to prevent energetic neutrals and ions from striking the walls of the source chamber, thereby desorbing unwanted gases into the ion source chamber. The results show a reduction of an order of magnitude in the total pressure during sparking over the conventional spark shield.
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