|Balmer Series Lab|| Notebook|
Lab Partner: Manuel Franco
We are going to learn how to calibrate the spectrometer using the known mercury spectrum. Then we are going to try to measure the hydrogen Balmer lines to determine the Rydberg constant. We'll measure the deuterium spectrum and we will try to determine how the Rydberg constant varies between hydrogen and deuterium.
Some images of the materials used
At the beginning of the lab Manuel and I attempted to use the mercury lamp to calibrate the spectrometer. Since we could not identify
the mercury lamp we started to check other lamps to calibrate the spectrometer. We decided to used one of the other lamps available
to calibrate the spectrometer. We thought that the neon lamp would be a good choice. As it turns out it was not. Our measurments of
the hydrogen spectrum were pretty bad. We tried again with helium. And we got very bad measurments as well. Finally playing around
with the lamps we were able to identify the mercury lamp, thanks to its very characteristic two yellow lines. (seen below).
With the mercury lamp identified, we proceded to calibrate the spectrometer and measure the spectral lines of the hydrogen and the
1st lab Hydrogen Measurements
Attention: This data should be disregarded since we did not take into account the gear back lash.
Calculated Rydberg constant for hydrogen = 1.0966E+07(+/- .0003) (1/m) 0.062% difference with the original value
Calculated Rydberg constant for deuterium = 1.0969E+07(+/- .0003) (1/m) 0.041% difference with the original value
Our calculated results for the Rydberg constant seem agree pretty well with the accepted values. This is a bit surprising to me since
our result for the red line in both hydrogen and deuterium was way off. This lab was very useful for me because it helped me toreinforce the concepts of standard deviation and standard error.SJK 12:06, 11 November 2008 (EST)