The Secondary-emission Electron Multiplier Tube Used on a Mass Spectrometer and its Amplification of Ion Currents

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概要

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• For the purpose of measuring very small ion currents by the mass spectrometer, a secondary electron multiplier, using the dynodes of copper-beryllium, has been constructed and installed. The amplification by the electron multiplier of various supplied voltages to the conversion dynode was measured for inert gas ions, and the amplification factor and its variation with the supplied voltage to the conversion dynode was compared with both the activated and the electro-polished dynode. For the electron multiplier using the electro-polished dynodes, the amplification was roughly inversely proportional to the square root of the ion mass, while for the activated dynode this was not the case. The average yield of the secondary electrons impacted by electrons on the copper-beryllium dynodes was determined, using the values of γ<SUB>i</SUB> which had been estimated by extrapolation of the data obtained in a previous study. The increase of the amplification factors of the electron multiplier due to the dynode activation was explained on the basis of an increase in γ<SUB>i</SUB> and \barδ due to dynode activation, an increase to be attributed to the formation of beryllium oxide layers. In this study, an amplification factor of a 10<SUP>5</SUP> order for inert gas ions has been obtained with the electron multiplier constructed with dynodes made from activated copper-beryllium. By using this electron multiplier, ion currents of 10 <SUP>－19</SUP> amperes are easily detectable with a mass spectrometer using a conventional D. C. amplifier.

• 社団法人 日本化学会の論文

著者

• SUGIURA T.

  Department of Surgery, Chiba University School of Medicine

• Sugiura Toshio

  Departmet of Applied Chemistry College of Engineering University of Osaka Prefecture

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