March09_2005_2pp

March09_2005_2pp - March 9 2005 Exam#2 1 week from today(7...

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1 March 9, 2005 ¾ Exam #2 ¾ 1 week from today (7 pm, B104) ¾ Review Session: Sunday, 7pm, B203 ¾ Info Page now online ! ¾ Prob Set #3 Solutions now online ! ¾ Now with extra fiber! ¾ Office Hours modifications this week ¾ Thursday: 12 – 1:30 pm (Waterman) ¾ Friday: 1:15 – 1:45 pm (A223 Cook) 2 Sample Cells -Cell windows made of alkali-metal halide (KBr, CsI, NaCl, etc.); largely transparent in IR Solids ( particulates should be smaller than λ IR ) -mix with KBr and press into a pellet OR -grind with heavy hydrocarbon oil (Nujol®) or halogenated polymer (Fluorolube®) -view resulting mull as a film between salt plates Gases -use long pathlength (up to 1000 meters!) to get adequate sensitivity
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3 Solution Samples Solvents -choose carefully, based on IR absorption and reactivity with salt windows (avoid water, alcohols) 4 More Solution Samples -narrow cell pathlengths (10 μm - 1 mm) needed to minimize absorption due to solvent
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5 Determining Cell Pathlength Get interference pattern due to
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