A cylindrical magnetic spectrometer has been constructed to study the electron-impact desorption of ions and neutrals from solid surfaces. The instrument has high-energy resolution and sensitivity and allows the determination of the charge-to-mass ratio of the emitted ions. The apparatus has been applied to the study of polycrystalline tungsten with O₂, CO, CO₂, H₂, N₂, and H₂O adsorbed. The ions which have been observed are O⁺ from O₂/W, CO/W, and CO₂/W; CO⁺ from CO/W; and H⁺ from H₂/W and H₂O/W. The ion energy distributions, ionic and total desorption cross sections, threshold energies, and other experimental results are presented and discussed.
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Nishijima et al. (1970) studied this question.
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