Abstract
An electron bombardment ionizer for detecting molecular beams is described. It is used in conjunction with a 90° magnetic focusing mass spectrometer and an electron multiplier and counting system. A fairly simple electrode arrangement is used but the method of construction is such that the output of residual ions is very small. For many types of beams a minimum input of 105 neutrals per sec can be detected when the integration time is 100 sec. The overall efficiency calculated from a variety of measurements is about one count for every 3 × 104 neutrals. Some discussion of the nature and and origin of the residual ions is included.
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