Basic Isotope Shift and estimation of th electron/proton mass ratio
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After completing the Balmer series lab for the Rydberg constant, take a spectrum of the Deuterium (D) tube provided by the instructor (again, with the HR2000 higher resolution spectrometer). 

Fit your peaks in the H spectra and the D spectrum with symmetric gaussians, with special attention to the location of the centers of the lines. Plot the line center differences versus the inverse wavelength. Do those data fit well with a line (as might be expected if the energy was proportional to the reduced mass...explain!)

Use the fact that the Rydberg is proportional to the REDUCED MASS of the electron-nucleus system to use one or two of the line center differences you measured to estimate the electron-proton mass ratio. You may assume that the nuetron has the same mass as the proton for simplicity.