lecture04 - Astronomy Picture of the Day Gliese 581...

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Unformatted text preview: Astronomy Picture of the Day Gliese 581 exoplanet (artists impression) 1 2 3 4 A simple model of atomic structure Electrons have discrete energy levels in an atom The electron can only be on these energy levels, not in between Outer orbits have greater energy than inner orbits 1 2 3 4 1 2 3 4 Transitions between energy levels The photon can only be absorbed if its energy (E = h ) is equal to the difference in energy between two energy levels In this case, E(photon) = h = E 2- E 1 1 2 3 4 1 2 3 4 Transitions between energy levels The energy of the photon is equal to the energy difference between the two energy levels In this case, E(photon) = h = E 3- E 1 1 2 3 4 Transitions between energy levels An electron in a high energy level can jump to the ground level all at once, or cascade downward in a series of steps through different energy levels 1 2 3 4 Transitions between energy levels An electron in a high energy level can jump to the ground level all at once, or cascade downward in a series of steps through different energy levels 1 2 3 4 Transitions between energy levels An electron in a high energy level can jump to the ground level all at once, or cascade downward in a series of steps through different energy levels 1 2 3 4 Transitions between energy levels An electron in a high energy level can jump to the ground level all at once, or cascade downward in a series of steps through different energy levels 1 2 3 4 Ionization of an atom by a photon If the photons energy is large enough, it can kick the electron out of the atom altogether An atom missing one or more electrons is called an ion 1 2 3 4 Ionization of an atom by a photon If the photons energy is large enough, it can kick the electron out of the atom altogether An atom missing one or more electrons is called an ion 1 2 3 4 Collisional Excitation In a collision between an atom and a free electron, the atom can absorb some of the collision energy by raising a bound electron to a higher energy level 1 2 3 4 Collisional Excitation In a collision between an atom and a free electron, the atom can absorb some of the collision energy by raising a bound electron to a higher energy level Recombination 1 2 3 4 Recombination: when a free electron becomes bound to an atom (it re-combines with an ion to make an atom) The electron gives up its energy by emitting a photon Recombination 1 2 3 4 Recombination: when a free electron becomes bound to an atom (it re-combines with an ion to make an atom) The electron gives up its energy by emitting a photon Recombination...
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This note was uploaded on 11/23/2010 for the course PHYSICS PHYSICS 20 taught by Professor Aaronbarth during the Winter '10 term at UC Irvine.

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lecture04 - Astronomy Picture of the Day Gliese 581...

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