NEGATIVE GLOW Meaning and
Definition
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The term "negative glow" refers to a luminous phenomenon that occurs in low-pressure gas discharges. It is a diffuse glowing region that appears as a faint, bluish-gray halo surrounding a cathode or electrode in the discharge tube.
The negative glow is characterized by its distinct brightness and color, which often contrasts with the darker glow that surrounds it known as the "positive column." This phenomenon arises from the excitation and ionization of gas molecules in the vicinity of the cathode due to the bombardment of electrons emitted from the cathode. The negative glow region typically extends from the cathode surface into the discharge space, spreading outwards in a spherical or cylindrical shape.
Within the negative glow, several processes occur. Excited gas molecules emit photons, producing the faint blue tint observed. Additionally, a substantial number of negative ions are present, which play a crucial role in sustaining the discharge by flowing towards the anode with their kinetic energy. The negative glow region is also associated with a higher electron density compared to the surrounding plasma, leading to more collisions and energy transfer.
The negative glow has proven significant in various applications, including emission studies, plasma processing, and as an indicator of discharge properties. Understanding the characteristics and behavior of the negative glow aids in the design and optimization of low-pressure gas discharges for a wide range of scientific and technological applications.
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Violet color appearing at the cathode when a current of high potential electricity is passed through a tube from which the air is partially exhausted.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Common Misspellings for NEGATIVE GLOW
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