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====First photomultiplier, single-stage (early 1934)==== The first documented photomultiplier demonstration dates to the early 1934 accomplishments of an [[RCA|RCA group]] based in Harrison, NJ. Harley Iams and Bernard Salzberg were the first to integrate a photoelectric-effect cathode and single secondary emission amplification stage in a single vacuum envelope and the first to characterize its performance as a photomultiplier with electron amplification gain. These accomplishments were finalized ''prior'' to June 1934 as detailed in the manuscript submitted to [[Proceedings of the Institute of Radio Engineers]] (Proc. IRE).<ref>{{cite journal|last1=Iams|first1=H.|last2=Salzberg|first2=B.|title=The Secondary Emission Phototube|journal=Proceedings of the IRE|volume=23|page=55|year=1935|doi=10.1109/JRPROC.1935.227243 |s2cid=51654002}}</ref> The device consisted of a semi-cylindrical [[photocathode]], a secondary emitter mounted on the axis, and a collector grid surrounding the secondary emitter. The tube had a gain of about eight and operated at frequencies well above 10 kHz.
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