(电子轰击) （化学电离） （快原子轰击） （场致点离） （等离子解析）
(电子轰击) （化学电离） （快原子轰击） （场致点离） （等离子解析）
Shield Electron slit Heater First accel.slit Second Molecular Gas Focus slit Filament /accel.slit leak \beam To mass analyzer Repellers Ionizing region Ion accelerating Electron region beam Anode Figure 20-3 An electron-impact ion source.(From R.M.Silverstein,G.C.Bassler, and T.C.Morrill,Spectrometric Identification of Organic Compounds,5th ed.,p.4.New York: Wiley,1991.Reprinted by permission of John Wiley Sons,Inc.)
撞击
撞击
Electron impact process 70 eV eledtrons are typkally used. At lower energies,you only get a small number of ions being produced. At higher energies the fragmentaion is too great and little information is obtained low ionization high fragmentation 70 eV
由进样系统来的样品气林 推斥极扳 狭链 灯丝 高子化室 电于束 人一阳极 G1G2 G4 鸟了束 至质量分析器 电子轰击源工作示意因