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1·It is unfavorable to study MS of aminoglycosides using electron impact ionization.

使用电子轰击离子化方法研究氨基糖甙类是不理想的。

2·Based on photoemission effect. we design a laser photoemission electron gun for electron impact ionization source of time of flight mass spectrometer.

基于光电效应原理。我们设计了一个新型脉冲激光光电子枪，它可以作为飞行时间质谱的电子碰撞电离的电离源。

3·Impact ionization arises from a charge injector (25), defining a virtual diode (30) in the substrate (20) of a floating gate charge storage transistor (11).

碰撞电离通过一在一浮栅电荷存储晶体管(11)的衬底(20)中限定一虚拟二极管(30)的电荷注入器(25)而产生。

4·Methods: Volatile oil was separated by solvent extraction and analysed by gas chromatography coupled with electron impact ionization-mass spectrometry (GC-MS).

方法：采用溶剂浸渍方法提取冬凌草中的挥发性成分，用GC - MS方法对冬凌草挥发油的化学成分进行分析。

5·A high reverse bias voltage creates a strong internal electric field, which accelerates the electrons through the silicon crystal lattice and produces secondary electrons by impact ionization.

一个高反向偏置电压产生一个强有力的内部电场，加速了通过硅晶格的电子，并通过碰撞电离产生二次电子。

6·The study of atomic inner-shell ionization cross-sections by low-energy electron impact is significant in both theoretical researches and practical applications.

低能电子碰撞原子内壳层电离截面测量的研究在理论和实际应用方面都具有重要意义。

7·Mass spectra (MS) of cholesterol esters and halides were obtained by means of Electron Impact (EI), Field Desorption (FD) and Chemical Ionization (CI).

研究了胆甾醇酯类和胆甾醇卤代物的电子轰击电离（EI）、场解吸电离（FD）、化学电离（CI）的质谱。