Abstract
The usual weekly laboratory experiment for the upper-division modern physics lab was replaced with a theme of studying diamond films grown on natural diamond. The diamonds were grown at the University of Alabama at Birmingham and were studied at university physics laboratories at UAB, Alabama A&M University, The University of the South, and the University of North Texas. Undergraduate students measured the molar fraction of 13C in diamond films grown by a microwave-assisted chemical vapor deposition process on 〈110〉 oriented diamond plates. The molar fraction of 13C for all diamond films except the 100% and 1% was determined from Rutherford backscattering measurements at 150°. Raman scattering of a 514.5nm Ar-ion laser beam from the same diamond films provided empirical determination of the molar fraction of 13C of the diamond films. Results from these measurements show good agreement between the nominal gas flows, Rutherford scattering, and empirical Raman determinations of the 13C molar fractions. This work took 10 lab periods and a long weekend.
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