论文信息 - Ionization Processes in CCl4 and SF6 by Electron Beams

Ionization Processes in CCl4 and SF6 by Electron Beams

The ionization processes in CCl4 and SF6 have been studied for both positive and negative ions in a mass spectrometer, and in a total ionization tube. The appearance potential of Cl− is 0+0.05 ev with a very sharp energy dependence. A second process with an onset at about 0.4 ev and a maximum at about 0.7 ev, exhibits a much broader energy dependence. The relative intensities of these two processes are found to be extremely sensitive to the energy distribution of the electron beam, but do not appear to exhibit a temperature dependence. From the appearance potentials and kinetic energy measurements of Cl− a value of 3.30±0.07 ev is obtained for D(CCl3–Cl). The appearance potential curves for CCl3+ and SF5+ near threshold indicate structure which may be associated with energy states of these ions.

R. Curran | R. E. Fox

[1] G. Schulz,et al. Excitation of Metastable Levels in Helium near Threshold , 1957 .

[2] V. H. Dibeler,et al. A Survey of Negative Ions in Mass Spectra of Polyatomic Molecules , 1956 .

[3] W. Hickam,et al. Electron Attachment in Sulfur Hexafluoride Using Monoenergetic Electrons , 1956 .

[4] D. Marsden,et al. Free Radicals by Mass Spectrometry. IX. Ionization Potentials of CF3 and CCl3 Radicals and Bond Dissociation Energies in Some Derivatives , 1956 .

[5] D. J. Grove,et al. Ionization in a Mass Spectrometer by Monoenergetic Electrons , 1955 .

[6] J. Craggs,et al. Negative Ion Formation in CCl4 and TiCl4 , 1954 .

[7] H. O. Pritchard. The Determination of Electron Affinities. , 1953 .

[8] J. Craggs,et al. Electron capture processes in polyatomic molecules , 1952 .

[9] J. Hipple,et al. The use of retarding potentials with the mass spectrometer. , 1948, The Review of scientific instruments.

[10] V. H. Dibeler,et al. Dissociation of SF6, CF4, and SiF4 by electron impact , 1948 .

[11] A. Nier. A Mass Spectrometer for Isotope and Gas Analysis , 1947 .