摘要
高场非对称波形离子迁移率谱(FAIMS)是一种利用不对称电场进行气相离子分离和检测的新技术。本文使用一种基于单电感反激电路产生正弦切割波形的方法,实现FAIMS的非对称分离电场,分析了该正弦切割波形在在0.8 MHz~1.4MHz频率范围的波形变化规律;使用10.6 eV(λ=116.5 nm)紫外灯为离化源的平板型FAIMS器件,研究在正弦切割波作用下的离子分离效果。结果表明,所产生的正弦切割波的正弦部分不随频率变化,当频率变化到1 MHz(即正弦部分与整个周期比值到达0.42)时,离子分离效果和检测分辨率最优。
High-Field asymmetric waveform ion mobility spectrometry(FAIMS)is a new technology for separation and identification of gas-phase ions.A low cost generator of clipped-sinusoidal waveform is constructed based on a simplified flyback circuit.The profile of clipped-sinusoidal waveforms under 0.8 MHz^1.4 MHz was analyzed and the properties of ion separation were tested with acetone,cyclohexane,and ethanol using a planar FAIMS with a 10.6 eV(λ= 116.5 nm)UV lamp as photoionization source.The results show that the best resolution can be obtained at a frequency of 1 MHz(ratio of sinusoidal part to whole waveform is equal to 0.42)and the resolution increases with the amplitude of clipped-sinusoidal waveform.
出处
《传感技术学报》
CAS
CSCD
北大核心
2012年第7期926-929,共4页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金项目(60901048)