激光原理英文版ch3完整.pptxVIP

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激光原理英文版ch3完整.pptx

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Team up (31 into 6: 5x5+6x1)DATE: 9/28Time limit：13~15minForm：Conference-like2. Interaction of Radiation with Atoms and Ions2.1 SUMMARY OF BLACKBODY RADIATION THEORY (the largest group)2.2 SPONTANEOUS EMISSION2.3 ABSORPTION AND STIMULATED EMISSION2.4 LINE BROADENING MECHANISMS 2.5 NONRADIATIVE DECAY AND ENERGY TRANSFER2.6 DEGENERATE OR STRONGLY COUPLED LEVELS2.7 SATURATION 2.8 DECAY OF AN OPTICALLY DENSE MEDIUMCh. 3 Energy Levels, Radiative and Nonradiative Transitions in MoleculesYong-Chang HanDepartment of PhysicsCh. 3 Energy Levels, Radiative and Nonradiative Transitions in Molecules3.1.1. Energy Levels3.1.2. Level Occupation at Thermal Equilibrium3.1.3. Stimulated Transitions3.1.4. Radiative and Nonradiative Decay3.1.1 Energy LevelsTotal energy of a moleculeelectronic energy, Eevibrational energy, Evrotational energy Ertranslational energyWe will not consider the translationalenergy any further since it is not usually quantized.electronic energy, Eevibrational energy, Evrotational energy ErDiatomic molecule （simple but exact）the order of magnitude of the energy difference between electronic levels, vibrational levels, and rotational levelsAnother version of electronic energy differenceSimilar for the comparison between ΔEe and ΔErDifference between J=0 and J=1Diatomic molecular PESParabola approximationB-O approximation, molecule Hamiltonian(research frontiers),Multi-atom molecule,Global potentialCh. 3 Energy Levels, Radiative and Nonradiative Transitions in Molecules3.1.1. Energy Levels3.1.2. Level Occupation at Thermal Equilibrium3.1.3. Stimulated Transitions3.1.4. Radiative and Nonradiative DecayCh. 3 Energy Levels, Radiative and Nonradiative Transitions in Molecules3.1.1. Energy Levels3.1.2. Level Occupation at Thermal Equilibrium3.1.3. Stimulated Transitions3.1.4. Radiative and Nonradiative Decay3.1.2 Level Occupation at Thermal EquilibriumAt thermodynamic equilibrium the population, N(Ee, Ev, Er), of a rotational-vibrational level belonging to a given elec