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Spectral lamps, explained by RP Photonics Encyclopedia; calibration lamps, low pressure gas discharge, wavelengths, helium, neon, sodium, cesium, mercury, cadmium
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🎈 Public Lab: Scan and compare different gases (in discharge tubes, like neon) using a DIY spectrometer
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Why does a gas discharged under low pressure give non-continuous spectra whereas it gives continuous spectra under high pressure? - Quora
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