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

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Unformatted text preview: Lecture 11 Excitation and Radiation Lecture 11 Purdue University, Astronomy 364 1 • 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 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. 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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This note was uploaded on 04/23/2011 for the course ASTR 364 taught by Professor Cui,weik. during the Spring '11 term at Purdue.

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

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