Chem #5 - Optical Spectroscopy By Yiliu (Peter) Wang...

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Optical Spectroscopy By Yiliu (Peter) Wang Teaching Assistant: Josie Bodle October 26 th , 2007
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Results and Discussion: The emission spectra from a variety of sources – fluorescent light, incandescent light, helium, salt solutions, and hydrogen gas were examined and analyzed using a spectroscope and a spectrophotometer. A procedure was designed to determine the composition of a solution that contained two or more ionic salts. A hydrogen emission spectra was used to construct a partial energy-level diagram for the gas. Device used for each experiment: All of the experiments were conducted using the computer spectrophotometer except for incandescent and fluorescent light, which was conducted using the spectroscope. The computer spectrophotometer, relative to the spectroscope, was deemed far more accurate, precise, and easier to use. Part A: Fluorescent Light Spectra: discontinuous spectra. Light was white Wavelength (nm) 420-440 440-500 540-570 612-620 620-680 Color Violet Blue/Turquoise Green Red Dark Red Rel. Intensity 3 2 10 8 2 Incandescent Light Spectra : continuous spectra. Light was yellow-ish The spectra were observed through the spectroscope and were found to be continuous throughout the visible spectrum. The intensity was bright throughout as well, with the relative intensity of 10. Helium Discharge Spectra : discontinuous spectra. Discharge was pinkish-orange, salmon- colored. Wavelength (nm) 388 447 501 588 667 700 Color Too low Indigo Turquoise Orange Dark red Very dark red Intensity - counts 600 500 650 3000 1000 1500
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Part B: Salt solution Spectra:
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Chem #5 - Optical Spectroscopy By Yiliu (Peter) Wang...

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