Abstract
A tandem mass spectrometer-energy analyzer for negative surface ionization studies and electron affinity determinations is described. The original technique is based on the investigation of the yields of negative surface ionization of neutral species formed by neutralization of positive ion beams on heated metal surfaces (W, Ta). The energy analysis of negative ions provides a good discrimination between negative ions deriving from negative surface ionization and those formed by subsidiary processes (sputtering, scattering, etc.). Preliminary results concerning the electron affinity of various elements (Cl, Br, I, S, Au) are given and the advantages of this method over others are discussed.
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