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26.7 x 6.9 cm ⏐ 10.5 x 2.7 in (300dpi)
PHIL DEGGINGER / SCIENCE PHOTO LIBRARY PHIL DEGGINGER / SCIENCE PHOTO LIBRARY
Neon emission spectroscopy. Emission spectroscopy examines the wavelengths of photons emitted by atoms or molecules during their transition from an excited state to a lower energy state.
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