lec11 - Lecture 11 Excitation and Radiation Lecture 11...

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Lecture 11 Excitation and Radiation Lecture 11 Purdue University, Astronomy 364 1
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HW02 is due NOW! HW03 has been posted. Reminder: Exam #1 on 2/21/2011 (Monday). Details will be posted to the course web page soon. Lecture 11 Purdue University, Astronomy 364 2
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Complex Atoms Electrons occupies discrete states, one per state, because they are fermions (i.e., the Pauli’s exclusion principle). Each state is specified by a set of quantum numbers (including the principal quantum number). The state with the lowest energy is the ground state . Electrons may make transitions between different states, emitting or absorbing a photon in the process. States transitions are governed by selection rules . Permitted transitions are those allowed by the selection rules, i.e., with high probabilities. Forbidden transitions are those not allowed by the selection rules (which are not absolute), i.e., with low probabilities.
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Photoexcitation Lecture 11 4 Purdue University, Astronomy 364 An atom may absorb a photon that has energy equal to E 2 -E 1 , which results in a transition of an electron from the ground state to an excited state: X + hv X * Radiation is absorbed in the process!
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