CHEM 1040 Lecture Notes - Principal Quantum Number, Atomic Orbital, Nanometre
17 Oct 2013
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The interaction of atoms or molecules with light is well documented: Examples include heated metals that give off light, ambient light effects, chemiluminescents, light bulbs, glow in the dark material. Important clues to the structure of atoms can come from analyzing emmisions or absorption of heat by atoms. Light: fluctuating electric and magnetic fields that are perpendicular to the motion of the wave and to eachother. H is planck"s constant h = 6. 63 x 10-34 j s. Planck proposed that electromagnetic irradiation come in packets of defined energy. Units: c m s-1, m, v s-1. c is the velocity of light: 300000000m/s in a vacuum. The unit s-1 = 1/s = reciprocal time ( per second ) Given the special name hertz, abbreviated hz : 1 hz = 1 s-1 (also know as cycles per second) De broglie suggested that the movement of small particles such as photons could be described as waves.
