THE IONIZATION OF METHANE AND METHYL HALIDES USING ELECTRON AND ION IMPACT.
Abstract
The ionization efficiency curve for CH4 was measured using the RPD technique. No break corresponding to the ionization of a /sa1/ electron is observed. Determination of the mass spectrum using charge exchange at different pressures indicates that the earlier value of the ionization potential, 19.4 eV, is probably due to ion-molecule reactions in the ion source. A tentative value of 24 eV is proposed in better agreement with theory. The breakdown graph of CH3C1 was determined by use of charge exchange. Pressure dependence studies of the CH3C1 and CH3I mass spectra, obtained in the same way, indicate that earlier determinations of the ionization potentials of the /sa1/ electrons of these molecules might also be due to ion-molecule reactions in the ion source. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 10, 1965
- Accession Number
- AD0623664
Entities
People
- H. Sjogren
Organizations
- Royal Institute of Technology