The purpose of this experiment was to construct an accurate spectroscope that included its own sort of
calibration system that could be determining by creating an equation based on the analysis of a particular
spectrum. From there, the spectroscope was used to observe and compare various other light emissions
from different sources such as discharge tubes, light bulbs, and flames. The purpose of this report is to
show the results of this experiment, as well as use emission line analysis of individual elements and
applying our observations to identify an unknown. This experiment also applies the understanding of the
relationships that exist between wavelength, frequency and energy of electromagnetic radiation in the
spectra of light. From these relationships we are able to determine the photon wavelength, frequencies,
energies, and, ultimately, the energy levels of these gaseous atoms within a point of spectra data.
Materials and Methods
The main source of reference for this experiment was the Chem 101L Laboratory Manual,
Experiment 7, Spring 2010. Another source of reference was Hyperphysics; an internet site that aided in
the supplying of the true values of the atomic line spectra of Balmer’s series of hydrogen.
To start, a pizza box, ruler, graph paper, black electrical tape, diffraction grating, and box cutter needed to
be obtained. Next, the box was laid out so it was completely flat, similar in position of Figure 6 in the lab
manual. The next step was to use the box cutter and ruler to cut the appropriate openings in the box, again
illustrated in Figure 6: First is the entrance slit, which was as vertically centered as possible on one side of
the box; specifically, a distance of about 30mm from the left corner of the box. The hole itself was about
30mm high and 10 mm wide.
The next hole to be cut was the sighting hole, which was cu on the opposite end of the entrance slit, as
shown again in Figure 6 in the manual. This hole was cut to about 20mm square, also with the same
distance as the entrance slit had from the left side of the box; approximately 30mm. It was also necessary
to completely cut out the marked section on the other end of the box so when it was folded you could
actually see out of the sighting hole.
After the sighting hole and entrance slit were both cut, the illuminating slot was the next to be made. It is