User:Ryan P. Long/Notebook/Physics 307L/2009/11/23: Difference between revisions
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* Antique “constant-deviation” spectrometer | * Antique “constant-deviation” spectrometer | ||
* Spectrum Tube Power Supply (Model SP200) | * Spectrum Tube Power Supply (Model SP200) | ||
* Spectrum Tube | * Mercury Vapor Spectrum Tube (S-68755-30-K) | ||
* Spectrum Tube | * Hydrogen Spectrum Tube (S-68755-30-G) | ||
* Spectrum Tube | * Deuterium Spectrum Tube (S-68755-30-E) | ||
==Setup== | ==Setup== | ||
Revision as of 13:29, 6 December 2009
 Balmer Series
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Balmer SeriesIn this lab, we observe various spectral lines emitted from both hydrogen and deuterium gas bulbs. Using a lamp to excite the gas, and a constant deviation spectrometer, we can record wavelengths for multiple lines, and using these results, determine the Rydberg constant. Equipment
Setup We begin my noting the hazards of the lamp, there is a risk of electric shock, it is very important to be certain that the lamp is off when changing out bulbs. The lamp also gets very hot, quickly, so one has to be weary of that when changing out bulbs. Next, we calibrated the spectrometer according to Professor Gold's manual. Calibration is done by using a mercury bulb and known mercury wavelengths listed in the manual. First we focused the spectrometer on the mercury spectrum by adjusting the slit width on the spectrometer, when the spectral lines are sharp and narrow, we then adjust the positioning of the prism. The prism is adjusted by a screw which rotates the prism until the given values of wavelength from the manual match up with the colors listed. During calibration and data collecting, it is important to turn the screw in one direction to avoid systematic error from gear back lash, as the gears have dead spots, when the direction is reversed. DataThe values collected in the google doc below are collected from two different gas bulbs, Hydrogen and Deuterium, we measured wavelengths for four different spectral line colors five times. {{#widget:Google Spreadsheet |
key=tQ7bmgkpVrGcQq9Z8otGAhQ | width=760 | height=300
}}
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