NS206_Ch4 - NS 206 Inside the Milky Way Chapter 4...

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NS 206 Inside the Milky Way Chapter 4 Spectroscopy
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Spectral Lines Spectroscope: splits light into component colors
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Is a blackbody spectrum continuous?
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Line Spectrum (Emission)
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Line Spectrum (Absorption)
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Spectral Lines Emission lines: Spectral features emitted at narrow frequency (wavelength) range by particular atoms Low-density, hot gas produces emission spectrum
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Spectral Lines Absorption spectrum: if a continuous spectrum passes through a cool gas, atoms of the gas will absorb the same frequencies they emit
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Formation of Spectral Lines Existence of spectral lines required new model of atom, so that only certain amounts of energy could be emitted or absorbed. Bohr model had certain allowed orbits for electron:
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Formation of Spectral Lines Absorption can boost an electron to the second (or higher) excited state. Two ways to decay: 1. to ground state & 2. cascade one orbital at a time
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Formation of Spectral Lines Emission line energies correspond to energy differences between allowed levels: Energy levels of the hydrogen atom (Lyman and Balmer series) b
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Absorption: Spectral Line Formation Emission:
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Spectral Lines Emission spectrum can be used to identify elements
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NS206_Ch4 - NS 206 Inside the Milky Way Chapter 4...

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