ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
A simple and small ion source (∼1 cm3) was developed to produce negative ions of even those elements having electron affinity less than ∼1 eV. A powdery sample (∼10 mg) deposited on a gauze (G, ∼0.1 cm2) was bombarded with electrons (up to ∼3 mA and ∼300 eV) emitted from a filament (F). The ions desorbed from G were easily extracted because F was mounted beneath G. Those ions of H−, D−, Li−, Cl−, Na−, F−, and Ag− were readily produced from various samples such as alkali hydrides and halides. The total ion current, its density and the ion yield (ion to electron current ratio) of H− from NaH, for example, were as large as ∼0.1 mA, ∼1 mA cm−2 and ∼1%, respectively, although the electric power to heat F was only ∼5 W. Similarly, H+ was readily produced. Introduction of H2 had little effect upon the yield of H±.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1145015
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