Physics

Projects

D lines of the alkali atoms

Measure the progression in the spacing of the np-n's transitions of the alkali atoms (Li -> Na -> Rb -> Cs). The energy change between the np 2P levels reflects the increasing importance of spin-orbit coupling as Z increases.

Isotope Effect in Hydrogen

The difference in wavelength for the four visible Balmer lines from hydrogen and deuterium. Measures the dependence of the spin orbit coupling on the principal quantum number, n

Fabry Perot Etalon

An interference device with a very high resolving power. Obtain the spectrum from a sodium lamp, a mercury lamp, and a cadmium lamp.

Spectrum of molecular nitrogen

Vibrational levels of a diatomic molecule, with influence from rotational levels

Gamma ray spectroscopy

Applying the principles of spectroscopy in a region of the electromagnetic spectrum well removed from the visible. Focus is on the different instrumentation, and its ability to resolve spectra

Doppler free spectroscopy (report only)

Even with high resolution equipment fine details can be rendered invisible by fundamental processes which broaden spectral lines, that is they are not truly a single wavelength. Doppler free spectroscopy is one means for overcoming the effects of the Doppler Effect in gases.

Spectra from ac lamps

Our instrumentation works well with light sources which have a constant output. When the output is fluctuating there are problems with the digital sampling. These are two possible ways of addressing the problem
Converting to run from  dc source
Lock in amplifier

Fourier transform spectroscopy (report only)

Based on the Michelson interferometer FTS can produce the spectrum of a source by measuring the interference pattern, and then using a computer algorithm to transform the interference pattern back to the spectrum.

View the Scoring Rubric

Samples