ELECTRON IMPACT STUDIES OF VOLATILE INORGANIC COMPOUNDS,
Abstract
The appearance potential of an ion is defined as the minimum energy of bombarding electrons required to produce that ion from a particular atom or molecule. This potential can be estimated from ionization-efficiency curves by various methods, such as the initial break method, linear extrapolation method, critical slope method, extrapolated difference method, second derivative method, ratio extrapolation method, and energy compensation method. By the use of appearance-potential data obtained from the mass spectrometer, the bond energies and heats of formation of unstable inorganic materials can be determined. Although there are several possible sources of error in a mass spectrometric thermochemical determination, it is often the only method by which these important properties can be determined for many of the transient and highly reactive molecules and radicals. Where literature values were available, there was usually good agreement between the thermochemical values determined by mass spectrometric measurement and those found by other methods. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 22, 1967
- Accession Number
- AD0664216
Entities
People
- F. E. Saalfeld
- M. V. Mcdowell
Organizations
- United States Naval Research Laboratory