Initial results of positron ionization mass spectrometry

Details Initial results of positron ionization mass spectrometry Initial results of positron ionization mass spectrometry

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3058..285d&link_type=abstract

In NASA, Goddard Space Flight Center, Annihilation in Gases and Galaxies, NASA CP-3058 p 285-287 (SEE N90-18957 11-70)

Physics

Ion Production Rates, Mass Spectra, Positrons, Vapor Phases, Atomic Excitations, Electron Impact, Mass Spectroscopy, Positronium, Targets, Time Of Flight Spectrometers

Scientific paper

The use of monoenergetic positrons for the ionization of organic molecules in the gas phase is described. The ionic products are analyzed with a time-of-flight mass spectrometer and detected to produce a mass spectrum. The ionization mechanisms which can be studied in this way include positron impact at energies above the ionization limit of the target molecules, positronium formation in the Ore gap energy range, and positron attachment at energies less than 1eV. The technique of positron ionization mass spectrometry (PIMS) may have analytical utility in that chemical selectivity is observed for one or more of these processes.

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