Physics 111: Laser Induced Fluorescence and Raman Scattering (LIF) Physics 111 Advanced Laboratory. Professor Sumner Davis This video accompanied the Laser Induced Fluorescence and Raman Scattering Experiment, providing students with an introduction to the theory, apparatus, and procedures. This experiment is no longer in use in the Physics 111 lab. Molecules in the gaseous state can absorb light when the frequency or photon energy matches the energy difference between two levels. A short time later, the molecules decay to lower energy states and emit photons (fluorescent light) with energies corresponding to energy differences between states. The lower states can be the same as or different from the original state. Observation of frequencies of light absorbed or of these fluorescence photons can tell us about the energy level structure of the molecule. In addition to absorption, molecules also scatter light no matter what its frequency. In this laboratory the techniques of absorption, laser induced fluorescence and scattering are used to study rotational, vibrational, and electronic energy levels of the ground and excited electronic states of diatomic molecular iodine, oxygen, and nitrogen. http://advancedlab.org
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This video is a part of a lecture series from of berkeley