The fluorescent sodium tube is designed to demonstrate resonance fluorescence in sodium.
Product Information: ..
The highly evacuated, argon-filled glass tube, with multiple distilled sodium coating is mounted on a panel with a viewing window and is intended for operation with the heater for the FranckHertz experiment.
The entire tube lights up, emitting the yellow Na D line, when heated up and illuminated by light with the sodium spectrum. If however, it is illuminated by white incandescent light, the spectrum of the transmitted light exhibits a dark absorption line where the Na D line would be.
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