CHAPTER 2 ULTRAVIOLET-VISIBLE ABSORPTION …
Spectroscopy Photomultiplier tubes A photomultiplier contains a photo-emissive cathode and several anodes (dynodes) in a vacuum. The cathode is coated with an easily ionized material such as alloys of alkali metals (K, Na, Ca, Mg) with Sb, Bi and / or Ag. A photon falling on the surface of the cathode causes the
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