Lecture11 - Photoelectric effect Emission of particles...

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1 Physical Chemistry Lecture 11 Introduction to Quantum Mechanics Spectra of atoms Early experiments Observed only certain emission frequencies Spectra of atoms Colors of mineral solutions Scientists involved have very familiar names Angstrom Balmer Bunsen Fraunhofer Kirchoff Rydberg Blackbodies and Atomic Energy Structure Planck’s theory of the quantization of modes of a cavity Blackbody radiation Bohr’s rejection of classical electrodynamics to interpret Rydberg’s hydrogen-atom spectrum Quantization of energy h E 2 2 1 1 ~ m n R H Photoelectric effect Emission of particles (electrons) by a metal due to interaction with light Einstein’s explanation (for which he got the Nobel Prize) involved assuming that the energy of a photon was proportional to its frequency Kinetic energy was independent of intensity of light Emission occurs only above a threshold value Kinetic energy is linear in the frequency Binding energy is known as the work function Results showed same fundamental constant as Planck h E K . . Particles acting like waves Louie de Broglie proposed that particles acted as waves in certain situations Proposed the particle’s momentum is related to “wavelength” Davisson and Germer verified that electrons
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This note was uploaded on 02/02/2012 for the course CHEM 419 taught by Professor Staff during the Fall '10 term at University of Delaware.

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Lecture11 - Photoelectric effect Emission of particles...

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