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Chapter 6 - Chapter 6 Electronic Structure of Atoms General...

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Chapter 6 Electronic Structure of Atoms General Chemistry I, General Chemistry I, © 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska
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Atoms can absorb (and then emit) light. Only certain frequencies of light can be absorbed by atoms. What is light? Electromagnetic Radiation λ×ν = c λ - wavelength A - amplitude ν - frequency c – speed of light (in vacuum) c = 2.998 × 10 8 m/s Electronic Structure of Atoms A A General Chemistry I, General Chemistry I, © 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska
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Eletromagnetic Radiation General Chemistry I, General Chemistry I, © 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska
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λ×ν = c λ - wavelength [m] ν - frequency [s 1 ] c – speed of light [m/s] frequency: 1 Hz = (1 cycle)/s Electromagnetic Radiation: Frequency General Chemistry I, General Chemistry I, © 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska
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λ×ν = c λ - wavelength [m], ν - frequency [s 1 ], c – speed of light [m/s] Electromagnetic Spectrum General Chemistry I, General Chemistry I, © 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska
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General Chemistry I, General Chemistry I, © 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska Electromagnetic Spectrum
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Electromagnetic Spectrum General Chemistry I, General Chemistry I, © 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska
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λ / nm Visible Light Spectrum General Chemistry I, General Chemistry I, © 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska
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Light emitted by a substance. continuous spectrum (solid substances) when we heat an object: Spectrum of a Substance General Chemistry I, General Chemistry I, © 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska red (hot) orange yellow white (hottest) Temperature of the object increases
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If we pass light from a continuous source (e.g., from a hot object) through a substance, then the continuous spectrum has some of the wavelengths removed! -- absorption spectrum Compare the absorption spectrum to the emission spectrum of H The Spectrum of Atomic Hydrogen General Chemistry I, General Chemistry I, © 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska absorption spectrum of H emission spectrum of H
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Blackbody Radiation Read this Section in your Textbook General Chemistry I, General Chemistry I, © 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska
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Intensity of Radiation Emitted by Blackbody General Chemistry I, General Chemistry I, © 2009 Professor Maggie Ciszkowska 2009 Professor Maggie Ciszkowska
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