Lecture_2 - 3. Atomic Spectrum of Hydrogen Spectrum of a...

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1 3. Atomic Spectrum of Hydrogen ± Spectrum of a white light source ± The rainbow sunlight dispersed by rain drops ± H 2 gas in a discharge tube: As the light emitted by the H atoms passes through a prism, only 4discrete lines (of 4 colors) are obtained: violet , blue , green , orange . Discrete or LINE spectrum, typical of chemical substances. ⎯→ H 2 H 2 voltage high spectra Continuous E 2 E 1 h ν E E E 1 2 = = Emission of a photon whose energy equals the difference between the two energy values 4. The BOHR Model ± Niels Bohr (1913): A quantum model in which the electron moves around the nucleus in just certain allowed circular orbits.
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2 r e + a. Balance of forces b. Total energy c. Quantization of angular momentum r v m r e 2 2 2 4 1 = o πε dr r e mv E P E K E r F + = + = 4 43 4 42 1 o 2 2 2 4 1 2 1 . . ... 3 , 2 , 1 2 = = n h n mvr π J 18 2 10 178 . 2 ; × = = H H n R n R E Rydberg constant Notes : n = : E = 0 (the reference state)
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This note was uploaded on 09/07/2010 for the course FAS chem 201 taught by Professor Sultan during the Summer '07 term at American University of Beirut.

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Lecture_2 - 3. Atomic Spectrum of Hydrogen Spectrum of a...

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