I. Main Functions
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Light source for UV spectrophotometers – Provides a stable, continuous ultraviolet spectrum for measuring sample absorbance.
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Light source for UV detectors in HPLC – Detects components with UV absorption in chromatographic analysis.
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Other analytical instruments – Including capillary electrophoresis systems and atomic absorption spectrometers (for background correction).
II. Working Principle
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A deuterium lamp is a low-pressure gas discharge lamp filled with deuterium gas (D₂), containing a cathode and an anode.
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The filament is heated to emit electrons. These electrons are accelerated by an electric field and collide with deuterium molecules, exciting them to higher energy states.
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When excited molecules return to lower energy states or dissociate, they emit a continuous UV spectrum (primary range: 190–400 nm).
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Characteristic: Strong continuous emission in the UV region, weak in the visible region.