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  • Title: High-flux beam source of fast neutral helium.
    Author: Fahey DW, Schearer LD, Parks WF.
    Journal: Rev Sci Instrum; 1978 Apr; 49(4):503. PubMed ID: 18699134.
    Abstract:
    A high-flux beam source of fast neutral helium has been constructed by extending the designs of previous authors. The source is a dc or pulsed electric discharge in an expanding gas nozzle. The beam produced has a flux on the order of 10(15) atoms/s sr and a mean velocity on the order of 10(7) cm/s. The composition of the beam has been determined by the use of particle detectors and by the observation of the excitation of certain target gases. An upper bound of 3.7 x 10(-5) has been estimated for the He(2(3)S(1))/He((1)S(0))beam density ratio and a value of 0.2 found for the He(+)/He(1(1)S(0)) beam density ratio.
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