论文信息 - A quantitative analysis of ion-molecule reactions occurring within the extraction orifice of a mass-spectrometric sampling probe

A quantitative analysis of ion-molecule reactions occurring within the extraction orifice of a mass-spectrometric sampling probe

Ion-molecule reactions occurring within a sampling probe orifice are studied with the help of a hollow cathode discharge. The change in intensity of a particular ion due to reactions in and behind the orifice will be negligible only if the radius and the length of the opening are kept small. A relation is given for the probability of orifice reactions as a function of orifice dimensions, reaction cross section and pressure. The effect was demonstrated and the relation was studied for the reaction H2O++H2O to H3O++OH in a pure water vapour discharge and the reactions N2++H2O to N2H++OH and N2H++H2O to H3O++N2 in a nitrogen-water vapour mixture.

H. Helm | W. Lindinger | F. Howorka | F. Egger | F. Handle

[1] W. Lindinger,et al. Ion sampling from the negative glow plasma in a cylindrical hollow cathode , 1973 .

[2] W. Lindinger. Reaction-Rate Constants in Steady-State Hollow-Cathode Discharges: Ar + H 2 O Reactions , 1973 .

[3] R. B. Canright,et al. Ion dipole capture cross sections at low ion and rotational energies - Comparison of integrated capture cross sections with reaction cross sections for NH3 and H2O parent-ion collisions. , 1972 .

[4] J. Coburn,et al. Pressure Considerations Associated with Ion Sampling from Glow Discharges , 1971 .

[5] M. M. Shahin. Mass Spectrometric Studies of Ion-Molecule Reactions in Gas Discharges , 1967 .

[6] M. Pahl. Massenspektrometrische Untersuchungen an der positiven Säule in Ar, Ar-He- und Ar-H2-Gemischen , 1963 .

[7] Z. Herman,et al. Mass spectrometric investigation of the reactions of ions and excited neutral particles in mixtures containing mercury vapour , 1963 .

[8] W. Walcher. Über eine Ionenquelle für massenspektroskopische Isotopentrennung , 1944 .