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handout_L13_BohrModel-1 - Lecture 13 Bohr Model of the Atom...

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Lecture 13: Bohr Model of the Atom Reading: Zumdahl 12.3, 12.4 • Outline – Emission spectrum of atomic hydrogen. – The Bohr model. – Extension to higher atomic number. Photon Emission Relaxation from one energy level to another by emitting a photon. • With E = hc/ λ • If λ = 440 nm, ∆Ε = 4.5 x 10 -19 J Emission Emission spectrum of H “Continuous” spectrum “Quantized” spectrum Any E is possible Only certain E are allowed E E Emission spectrum of H (cont.) Light Bulb Hydrogen Lamp Quantized, not continuous Emission spectrum of H (cont.) We can use the emission spectrum to determine the energy levels for the hydrogen atom. Balmer Model Joseph Balmer (1885) first noticed that the frequency of visible lines in the H atom spectrum could be reproduced by: ν 1 2 2 1 n 2 n = 3, 4, 5, ….. The above equation predicts that as n increases, the frequencies become more closely spaced.
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Rydberg Model Johann Rydberg extends the Balmer model by
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