optical spectroscopy lab - Chris Stanton Chemistry 216...

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Chris Stanton February 1, 2007 Chemistry 216 Optical Spectroscopy I. Introduction This lab involved the measurement and analysis of electromagnetic radiation in the form of light. The waves of light are characterized by the variables of frequency and wavelength, both of which can be measured or calculated. The frequency, or the number of wave crests passing a given point per second, is inversely proportional to the wavelength, or the distance between successive wave crests. Visible light ranges from 400 nm to 800 nm on the electromagnetic spectrum and are related to each other through the equation: c = λv. This lab involved using both a hand-held spectroscope as well as a research-grade spectrometer to measure the waves of light being emitted from sources such as an incandescent light bulb, fluorescent light, helium, hydrogen, and even salt solutions. After viewing the various known salt solutions, an unknown salt solution is tested and identified using the instruments. II. Experimental Procedure A. Preliminary Work Using a simple diffraction grating, observe both an incandescent light bulb as well as a fluorescent light by holding it close to your eye and looking through it. If the spectra are aligned vertically, turn the grating 90 degrees so that they are horizontal. Observe the spectra created and describe what you see. B. Fluorescent Light Spectrum Observe the fluorescent light with both the hand-held spectroscope as well as the research-grade spectrometer. When using the hand-help spectroscope, record the data you see by using the lines that you see on the different wavelengths and rate them by intensity (1 to 10; 10 being the brightest). When using the research-grade spectrometer, the wavelength is shown and the intensity scale is recorded on the y-axis.
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This note was uploaded on 11/05/2009 for the course CHEM 2160 taught by Professor Lee, s during the Spring '08 term at Cornell University (Engineering School).

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optical spectroscopy lab - Chris Stanton Chemistry 216...

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