Model GC-4400 Photo ionization Gas Chromatograph development by Beijing City East and west Electronic Technology Institute is described in this article.

介绍了北京市东西电子技术研究所（北京东西分析仪器有限公司）、开发生产的的GC-4400型便携式光离子化气相色谱仪。

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A kind of field ionization gas sensor was designed and fabricated, the corresponding test equipment for current and voltage measurement was established.

设计并研制出基于一维纳米材料的场致电离传感器，建立了相应的电流或电压测试平台。

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Progress of the research in field ionization gas sensor was investigated and there are still some disadvantages: high working voltage, bad selectivity and stability.

在对国内外场致电离气体传感器研究进展进行详细调研的基础上，发现它始终存在着工作电压高、选择性差和稳定性差问题。

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This is called ionization, gas phase species loses an electron.

而这个过程是离子化，气相组分失去一个电子。

麻省理工公开课 - 固态化学导论课程节选

So we are really looking at this reaction here H+ for ionization. It is H gas neutral goes to H plus in the gas phase plus the electron. And, furthermore, we can have multiple ionization energies.

所以我们真正看到的是,电离，它是在气相中H变为,和电子的过程，还有，我们能电离能加倍。

麻省理工公开课 - 固态化学导论课程节选