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A small probe surface at a positive potential in a discharge may draw a current of many amperes per cm2 with the potential gradient limited to a thin sheath over the surface. Under such conditions a continuous spectrum is emitted by metal surfaces in caesium, potassium, and helium discharges. With a copper probe at 7 volts in caesium vapor, the intensity J" (X) remains of the same magnitude between 6,200 and 2,400 A with a minimum at 5,800 and a maximum at 3,800. Below 4 volts the spectrum has a high-frequency limit in this range (3,000 A for copper at 2.15 volts). On the assumption that this is analogous to a continuous X-ray spectrum, observed limits indicate work functions of 1.95 volts for Cu, 2.1 for Ag, 1.45 for W (all in caesium vapor). The absolute intensity (except for Ag) agrees within a factor of 2 with values computed from the theoretical equation for intensity of the continuous X-ray spectrum. Efficiency for Cu at 7 volts is estimated as 5X10 . Comparison with published data on photo-electric effect of radiation from electron bombardment of metals indicates that the magnitude of effects below 10 volts can be ^explained by this continuous spectrum. CONTENTS Page

Radiation from metals bombarded by low-speed electrons