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Olympus FluoView Resource Center: Electronic Light Detectors: Photomultipliers (5857 words) |
 | The impact of a photoelectron on the first dynode releases additional electrons (usually between 5 and 10) that are accelerated in turn toward the next dynode, which also has a potential difference of about 100 volts with respect to the first. |
| Upon exiting the dynode chain, the pulse of multiplied electrons is collected on the anode, which usually has a potential difference of approximately 1000 volts with respect to the photocathode. |
| By carefully matching dynode shape and proximity to the large interspersed electric fields, the output pulse on the anode can be reduced to several nanoseconds in duration to preserve the temporal profile of the initial optical signal. |
| Dynode - Wikipedia, the free encyclopedia (81 words) |
| A dynode is one of a series of electrodes within a photomultiplier tube. |
| Each dynode is more positively charged than its predecessor. |
| Such an arrangement is able to amplify the tiny current emitted by the photocathode by typically one million. |
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