CHEM 107 Lecture Notes - Lecture 44: Neon Lighting, Emission Spectrum, Photon

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11 Aug 2017
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An element that is vaporized (gas phase) and then excited electrically emits a light that when passed through a prism generates a line spectrum characteristic for that particular element. Separates a light source into its component wavelengths. Does not create a continuous spectrum as sunlight does. The lines occur at specific wavelengths (related to energy) separated by black spaces. Can only be certain values (n = 1, 2, 3, ) specified by a quantum number. Changes as you move from level to level are not equal. Line absorption/emission is due to electron transitions between levels. Atom absorbs a photon atom gains energy electron moves to higher orbital. Atom emits a photon atom has lost energy electron has moved to a lower orbital. The photon absorbed must have a higher energy than the one emitted. Light of a specific wavelength (and energy) is emitted as electron relax into lower energy state.

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