The transmission of a circular orifice in the molecular flow range is calculated for the case that the particular state of particles flowing through the orifice is affected by wall collisions. The deactivation of metastable atoms and the neutralisation of charged particles at the orifice tube wall is taken into account. The results give a detailed illustration of the fate of particles passing an extraction orifice, namely the fraction of particles passing without wall collision, the fraction passing after one and after multiple wall reflections as a function of the characteristic dimensions of the orifice and the reflection coefficient.
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H. Helm (1978) studied this question.
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