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The performance of an experimental ultra-high vacuum system employing the combination of a sorption pump and a getter-ion pump is described. Measurements done on this system using dry air indicate that the most suitable pressure for switching-on the getter-ion pump is 1•'2•~10-2 mmHg, and fordoi:10.3131/jvsj.6.89 fatcat:u6lmpplvczh7fiea6lkizzthpi