REFERENCES
1.
We have used a “Vac‐Ion” pump, manufactured by Varian Associates, Palo Alto, California, and have benefited from discussions with Dr.
L.
Hall
of Varian regarding its use [Rev. Sci. Instr.
29
, 367
(1958
)].2.
3.
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© 1958 The American Institute of Physics.
1958
The American Institute of Physics
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