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Fig. 1. An energy diagram for an electron with –1.3 eV of energy. First citation in article

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Fig. 2. An energy diagram of an electron resulting in the emission of a 2.0-eV photon. First citation in article

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Fig. 3. Gas Lamp Emission Spectroscopy program. First citation in article

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Fig. 4. Energy Band Creator program. First citation in article

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Fig. 5. Fluorescence Spectroscopy program. First citation in article