Radiant energy – Ion generation – Field ionization type
Patent
1977-11-30
1979-06-19
Anderson, Bruce C.
Radiant energy
Ion generation
Field ionization type
250281, 250282, B01D 5944, B01J 3934
Patent
active
041587758
ABSTRACT:
A system for determining the stable energy levels of a species ion, of an atomic, molecular, or radical type, by application of ionizing energy of a predetermined level, such as through photoionization. The system adds a trapping gas to the gaseous species to provide a technique for detection of the energy levels. The electrons emitted from ionized species are captured by the trapping gas, only if the electrons have substantially zero kinetic energy. If the electrons have nearly zero energy, they are absorbed by the trapping gas to produce negative ions of the trapping gas that can be detected by a mass spectrometer. The applied energies (i.e. light frequencies) at which large quantities of trapping gas ions are detected, are the stable energy levels of the positive ion of the species. SF.sub.6 and CFCl.sub.3 have the narrowest acceptance bands, so that when they are used as the trapping gas, they bind electrons (to form negative ions) only when the electrons have very close to zero kinetic energy.
REFERENCES:
patent: 3521054 (1970-07-01), Webb
patent: 3626181 (1971-12-01), Wernlund
patent: 3742213 (1973-06-01), Cohen et al.
patent: 3987302 (1976-10-01), Hurst et al.
Ajello Joseph M.
Chutjian Ara
Frosch Robert A. Administrator of the National Aeronautics and Space
Anderson Bruce C.
Manning John R.
McCaul Paul F.
Mott Monte F.
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