登伯效应
登伯效应（英语：Dember effect):在电路中，用光照射其阴极，由光电效应在电路中产生光电电流I1；如用电子轰击阴极，电子的动能除激发电流外，还能使电极周围气体游离也能产生电流，称为电子轰击电流I2。在阴极上同时用光照射和电子轰击，此时电路上所产生的电流I3；而I3>I1+I2; 这种现象称为登伯效应。 登伯效应是美国科学家亨利·登伯（1882-1943）于1925年发现的。他当时只用金属作阴极研究，自发现此效应后；用作研究的阴极材料已扩展到半导体和金属化合物等。
Dember effect
中文百科
英语百科
Dember effect 登伯效应
In physics, the Dember effect is when the electron current from a cathode ![(I_3)](/Images/godic/202501/08/a693cee8ff9d5669441eff4ed7d56b3c0442.png")
subjected to both illumination and a simultaneous electron bombardment is greater than the sum of the photoelectric current ![(I_1)](/Images/godic/202501/08/e4db679e958048941532d35fa2ef119c0442.png")
and the secondary emission current ![(I_2)](/Images/godic/202501/08/e800d65e9a3ef1620a5b9cb7efe4d19a0442.png")
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