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ChE 350 F11 Lecture 3_Xray diffraction

ChE 350 F11 Lecture 3_Xray diffraction - Iridescent...

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Iridescent : Displaying colours like those of the rainbow, or those reflected from soap-bubbles and the like; glittering or flashing with colours which change according to the position from which they are viewed. 1830 M. Donovan Domest. Econ. II. iii. 183 The Mackerel is a handsome fish… The sides are iridescent like mother-of-pearl, but more silvery.
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Iridescence is due to the diffraction of light 1. There is a collection of objects capable of diffracting the light 2. The objects are arranged with spacings similar to the wavelength of the light
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Iridescence from the wing of a papilio butterfly
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Young’s Double-Slit Experiment demonstrates the physical basis for iridescence http://www.youtube.com/watch?v=FeCV27-mk0I&NR=1 http://www.youtube.com/watch?v=9UkkKM1IkKg&feature=related
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Interference patterns between diffracted waves
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Diffraction patterns
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Max Von Laue: 1914 Nobel Prize Winner Initial X-ray diffraction pattern from Copper sulfate (triclinic)
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Copper sulfate CuSO 4
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Copper sulfate X-ray diffraction pattern
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Bragg: Nobel Prize in 1915 Ball and stick model of NaCl
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Bragg’s Law Concept: X-rays diffracted off crystal
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