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VG5400质谱计是中国科学院生物气体地球化学开放研究实验室近来引进的国内第一台稀有气体静态真空质谱计.其主要特点是:仪器所有部件采用不锈钢加工和氩弧焊接用金丝或无氧铜垫密封连接能经爱300—350℃高温的长时间烘烤排气,静态真空约5×10_(-9)mbar.质谱计采用电子轰击式尼尔离子源,源外加有永久磁场,离子源的推斥极、聚焦极、电子能量的电压连续可调.离子小分析磁场的曲率半径为270mm,偏转90°.电磁铁电流在0—6.5A范围内连续可调,可产生0—6500高斯的磁场,离子流的检测采用偏轴线高质量法拉弟杯(Faradaycup)和轴线德利(Daly)—光电倍增器双接收器.分析数据由计算机收集并进行结果的处理.
VG5400 mass spectrometer is the first rare gas static vacuum mass spectrometer recently introduced by the Research Institute of Biogeochemical Geochemistry of Chinese Academy of Sciences.The main features are: All parts of the instrument are made of stainless steel and argon arc welding with gold wire or oxygen-free copper The mat-sealed connection can be baked for a long time at a temperature of 300-350 ° C with a static vacuum of about 5 × 10 -9 mbar. The mass spectrometer uses an electron-bombarding Neil source with a permanent magnetic field and an ion source Of the repeller, focusing pole, electron energy voltage continuously adjustable ion analysis of the magnetic field radius of curvature of 270mm, deflection 90. Electromagnet current in the range of 0-6.5A continuously adjustable, can produce 0-6500 Gauss Ion beam was detected using a high-quality, off-axis Faraday cup and an axis Daly photomultiplier dual receiver.The analytical data were collected by computer and processed for results.