Abstract
Abstract When a metal surface is gradually covered with atoms of an electropositive metal (Ba on Mo), the secondary and photoelectric emission both pass through a maximum at the same degree of covering (σ = σ m). From this it may be concluded that the rise of the secondary emission is caused by the decrease of the workfunction. The secondary emission is a linear function ofσ, with small degree of covering (σ ≪ σ m) the photoelectric emission is an exponential function ofσ (irradiation with white visible light). This difference is caused by the fact that the energy of the escaping secondary electrons is much greater than that of the photoelectrons. It is shown, that a selective secondary emission from the adsorbed atoms might be observable with slowly moving primary electrons.
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