phy392_lecture12_web_2011

phy392_lecture12_web_2011 - PHY392S Physics of Climate of...

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PHY392S hysics of Climate Physics of Climate Lecture 12 - Complete Notes Spectroscopy Spectroscopy bsorption in the Earth’s Atmosphere pp PHY392 - Physics of Climate Lecture 12, Page 1
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Reminders Note: My office hours Problem Set #1 Returned to you today olutions are osted online, password protected. .. are cancelled today. Solutions are posted online, password protected. Problem Set #2 Handed out on Monday, due in class Monday, February 28 ate penalty is 5% per day up to 7 days Late penalty is 5% per day, up to 7 days Mid-term Test 3:00 - 4:00 (we can start at 3.0 sharp), in class, Weds., March 2 overs all material up to and including Lecture 12: Covers all material up to and including Lecture 12: slides, blackboard notes, readings, Marshall & Plumb Chapter 2 Will include a combination of short answer and calculation questions have osted st year’sm id rm test and solutions (with password I have posted last year s mid-term test and solutions (with password) Supplementary Notes I have posted a set of notes that were used in PHY315 and which over some of the radiation material that is not in Marshall & Plumb cover some of the radiation material that is not in Marshall & Plumb You may find these useful when studying PHY392 - Physics of Climate Lecture 9, Page 2
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Interaction of the Radiation Field with Gases in the Atmosphere We now need to look at the processes by which energy can be absorbed in planetary atmospheres - spectroscopy . These processes are related to the atomic and molecular properties of the gases in the atmosphere. otation Rotation Vibration Electronic transitions Types of transitions in the internal energy of the molecules, in order of creasing energy Photodissociation increasing energy E 2 E 1 h absorption h emission E 0 PHY392 - Physics of Climate Lecture 12, Page 3
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Interaction of the Radiation Field with Gases in the Atmosphere Solar interactions Electronic Photolysis & photodissociation Thermal IR interactions Rotation ibration Vibration Electronic PHY392 - Physics of Climate Lecture 12, Page 4
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Energy Diagrams Bohr frequency condition: When an atom changes its energy by E, the difference is carried away as a photon of frequency , where: E = h Radiation is absorbed and emitted by atoms only at certain wavenumbers, so only certain energy states of atoms are permitted. n nergy r rm diagram hows the n = An energy or term diagram shows the allowed energy levels of a system. Energy is on the y axis. =2 n = 3 E For every allowed energy level there is a line. he only allowed transitions move n = 2 The only allowed transitions move energy from one line to another. n = 1 Term diagram for hydrogen PHY392 - Physics of Climate Lecture 12, Page 5
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The Spectrum of Hydrogen - Emission Transition - + + photon Ground state photon Excited state Absorption ransition - - + round state Transition + Emission and absorption for a hydrogen atom that is composed of ne proton and one electron The radius of the circular orbit is given
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phy392_lecture12_web_2011 - PHY392S Physics of Climate of...

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