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Negative Corona Discharge Ion Source Under Ambient Conditions with Mini Line-cylinder Electrodes
Kun Liu,Fei Tang *,Xiao-hao Wang,Liang Zhang,Xue-ye Wei
Author NameAffiliation
Kun Liu School of Electronics and Information Engineering, Beijing Jiaotong University, Beijing 100044, China 
Fei Tang * State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China 
Xiao-hao Wang State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China 
Liang Zhang State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments and Mechanology, Tsinghua University, Beijing 100084, China 
Xue-ye Wei School of Electronics and Information Engineering, Beijing Jiaotong University, Beijing 100044, China 
Abstract:
A novel ambient negative corona discharge ion source with mini line-cylinder electrodes is designed. The diameters of inner and outer electrode are 0.16 and 4 mm respectively. With a special assembly method, a perfect coaxiality of the two electrodes is obtained. An injection system utilizing a temperature control technique, achieves a constant and stable concentration of the sample, which is critical to the experiment. The formulas of the corona onset voltage of line-cylinder electrodes are also introduced. The experiment results show that negative substances such as formic acid and acetic acid can be ionized under ambient conditions. When combined with micro electrical mechanical system fabrication process, the volume of the ion source can be reduced dramatically, but there is an undesirable surface discharge. To solve the surface discharge problem, an improved structure was designed and tested. The simplicity of the interface of the ion source makes it suitable for mass spectrometer, micro mass spectrometer, ion mobility spectrometer, and high-field asymmetric waveform ion mobility spectrometer applications
Key words:  Line-cylinder corona discharge, Ion source, Surface discharge, Ambient mass spectrometry, Micro electrical mechanical system
FundProject:
Negative Corona Discharge Ion Source Under Ambient Conditions with Mini Line-cylinder Electrodes
刘坤,唐飞 *,王晓浩,张亮,魏学业
摘要:
提出了一种新型的可在大气环境下工作的离子源.该离子源通过电晕放电产生离子,为线-筒结构,由内电极和外筒电极组成,电极半径分别是0.16和4 mm.采用了一系列夹持方法,保证了内外电极具有较高的同轴度.设计了一套进样系统,可以控制进入离子源的样品浓度.给出了放电启动电压的计算公式.实验表明,在大气环境条件下可以很好地电离甲酸、乙酸等负电性的化学物质.为了减小离子源的体积,引入了微机电系统技术.改进了原线-筒型结构以防止随之而来的沿面放电.该离子源接口简单,可广泛应用于质谱仪、MMS、IMS和FAIMS上.
关键词:  线筒型电晕放电,离子源,沿面放电,敞开式质谱
DOI:10.1088/1674-0068/22/01/107-112
分类号: