Crookes dark space
Quick Summary
The Crookes dark space, also known as the cathode dark space, is a region within a gas-filled discharge tube where a dark area appears between the cathode glow and the negative glow. This phenomenon was observed by Sir William Crookes during his studies of electrical discharges through rarefied gases.123
In the context of electronics, cathode rays are streams of electrons emitted from a negative electrode (cathode) in a vacuum tube or a gas at low pressure. These rays can cause materials to emit light and can be deflected by electric or magnetic fields, forming the basis for technologies like oscilloscopes and television picture tubes. The Crookes dark space is one of several non-luminous regions observed in such discharge tubes, where ions must gain sufficient energy to excite fluorescence.456
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