A New Method of Measuring the Ion Current of Mass Spectrometers
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概要
- 論文の詳細を見る
In most mass spectrometers the ion current received by the collector is measured by D. C. amplifiers, but it is preferable to use A. C. amplifiers, if possible, because in A. C. amplifiers there is no zero point drift and the number of stages can be easily increased. We have intended to use an A.C. amplifier in mass spectrometer of Nier type. The ion current was made alternating by making the potential of the first slit which pulls out the ions from the ion source to have a rectangular form of -4 volts and +1 volt relative to the ion source chamber. The ion current amplified by a three stage A.C. amplifier of 110 db was rectified and then measured by a D.C. milliammeter of 1 mA full scale. The amplifier operated very stable and the current amplification factor was about 0.7×10^<10>, the minimum ion current detectable at the collector being about 1.5×10^<-15> amperes.
- 社団法人日本物理学会の論文
- 1951-12-25
著者
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NONAKA Itaru
Department of Physics, Chiba University
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Nonaka Itaru
Department Of Physics Chiba University
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Nonaka Itaru
Department Of Physics Faculty Of Science Kyusyu University
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HIRASAWA Shinpachi
Matsuda Research Laboratory. Tokyo-Shibaura Electric Co.
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TSUTSUMI Kazushige
Matsuda Research Laboratory. Tokyo-Shibaura Electric Co.
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