CHEM 112 Lecture Notes - Lecture 2: Bohr Model, Electromagnetic Radiation, Bohr Radius
21 Oct 2017
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8. 1 electromagnetic radiation electromagnetic radiation: propagated waves through empty space or through a medium: maxwell 1865: electromagnetic radiation can be produced by an electrically charged particle. Principal wavelength component: red light of 656. 3 nm. Only a limited number of well-defined energy values are available to excite gaseous atoms. Blackbody radiation: light emission by heated solids. Photoelectric effect light strikes surface of metal and electrons are ejected frequency (v) is greater or equal to the threshold frequency (v0) gaseous atoms electric discharge emission spectrum separate lines. Bohr theory and spectroscopy frequency of photon: vphoton = (ei ef)/h for emission spectroscopy: photons of frequency v emitted when atoms relax, vphoton = (ef ei)/h for absorption spectroscopy. Hvphoton = ei = -e1 = rh/1^2 for ionization of hydrogen. Ei = ionization energy where z = atomic number for particles with one electron (hydrogen-like) 8. 5 two ideas leading to a new quantum mechanics relates energy of a particle with wavelength (wave properties: wave-particle duality.
