| 摘要 |
<p>The photomultiplier comprises a photocathode (103) receiving incident light and a plurality of dynodes (104-113) for cascade multiplying electrons emitted from the photocathodes, by secondary emission. The photomultiplier includes a slowing-down electrode (60) for decelerating those of secondary electron emitted from a first stage dynode (104) to a second stage dynode (105) which have a higher speed. Because of the slowing-down electrode the secondary electrons having a higher speed are selectively decelerated, whereby a transit time spread of the secondary electrons emitted from parts of the first stage-dynode to the second stage-dynode is relatively decreased. <IMAGE></p> |
