This paper report the design parameters, construction and specificity of a small magnetic mass spectrometer with an EI ion source, a sector magnetic analyser and a Faraday cup ion detector.

本文报道一种由电子轰击型离子源、扇形磁分析器与法拉第筒式离子检测器组成的小型质谱计，介绍其设计参数、结构与性能。

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One of the advantages of the mass spectrometer is that it can record spectra from small quantities of substance.

质谱计的优点之一是它能记录少量物质的质谱。

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AIDS. The likelihood that a mutant protein can slip through unnoticed is small: the spectrometer can tell apart proteins that differ by less than a tenth of a proton mass in weight.

ECONOMIST: Viruses: Hunt the mutant | The