The Study on a Secondary Electron Multiplier Tube(II)
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A 12-stage secondary-electron multiplier with CuBe alloy(2% Be)dynodes was constructed. The dynodes were treated and polished by the same method as previously reported. The over-all gain of this multiplier, when installed in a mass spectrometer, settled down to about 10<SUP>4</SUP>, the applied voltage being 300 volts per stage and the ion energy about 5.6KV. The noise level, measured with the vibrating reed electrometer, corresponds to the ion current of about1.5×10<SUP>-18</SUP>A at the pressure of 1.4×10<SUP>-5</SUP>mmHg. The over-all gain is nearly constant in the pressure region of -10<SUP>-5</SUP>mmHg, and is not seriously affected by exposure for a short time.
- 日本質量分析学会の論文
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