IMG_0001_NEW_0019 - UltravioleWisible light - sunlight...

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Spectroscopy The study of the interaction of molecules with electromagnetic radiation Electromagnetic spectrum: (recall E = hv = hc/}") High Energy (I in prm) Low Energy t NMR uv' lR and NMR are key spectroscopic tools for the organic chemist. We will focus on lR and NMR. How do these rays interact with matter? y'Rays (gamma rays) - emitted by the nuclei of certain radioactive elements - extremely high energy _ cause ionization - penetrate tissues and kiil ceils therefore used in cancer treatment X'Rays - not as high in energy as y-Rays and therefore not as destructive to tissues and do not penetrate as deep as y-Rays - since they are absorbed by tissues, when an X_ray is taken, the regions of high and row density can be differentiated - arso ionize morecures so they are stiil dangerous
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Unformatted text preview: UltravioleWisible light - sunlight (causes burnsl) sH * - interacts with erectrons in n bonds by exciting A A them to higher energy revers (recail n. antibo-nding f-Y )f\ orbitars) Hsco'xe \r' #:::;T:'rT:;Tl,or unsaturated orsanics that oxybenzone lnfrared radiation - sometimes referred to as heat radiation- 50% of sun's heating effect due to lR radiation in sunlight- often used in remote controls- interacts with stretching and bending motions in bonds causing them to move more and consequenfly heat up Microwave - long wavelength - interacts with molecules with a dipole. These f UV t IK 1o'u to "1 o-o 1o'o to o.i 0.1 io 0.4 0.4 io 0.8 0.8 to 102 10' to 1 ou lou to loto...
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