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Commit id: 13d3f5af2d303467513bf32c3aab2ae380f45c11

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\textbf{Abstract}  \end{centering}  \begin{centering}  \par We performed both Doppler and subDoppler  spectroscopy on the $5^{2}S_{1/2}$ → $5^{2}P_{3/2}$ transition of rubidium 85 ($^85$ Rb) ($^{85}$Rb)  and rubidium 87 ($^87$ Rb). Using ($^{87}$Rb). We fit the  Doppler spectroscopy, we found spectroscopy curves to Maxwell Boltzmann velocity distributions to determine  the energies temperature  of the transition of cell. We also fit  the subDoppler spectroscopy curves to extract the transition energies and hyperfinestructure  of the $5^{2}S_{1/2}$ F=2 ground stateof rubidium 85  to the $5^{2}P_{3/2}$ state, the F=1, F=2, and  F=3 excited state states  of $^{85}$Rb,  the $5^{2}S_{1/2}$ F=3 ground  stateof rubidium 85  to the $5^{2}P_{3/2}$ state, the F=1 F=2, F=3, and F=4  excited state states  of $^{85}$Rb,  the $5^{2}S_{1/2}$ F=1 ground  stateof rubidium 87  to the $5^{2}P_{3/2}$ state, F=0, F=1,  andthe  F=2 excited state states  of $^{87}$Rb, and  the $5^{2}S_{1/2}$ F=2 ground  stateof rubidium 87  to the $5^{2}P_{3/2}$ state. F=1, F=2, and F=3 excited states of $^{87}$Rb. The  Our results were not quite consistent with theory within uncertainty, but there are many possible reasons for this slight discrepancy. Using saturation absorption spectroscopy, we were able to resolve The uncertainty in  the hyperfine structure of each Doppler profile fitting is most likely due to an incomplete model  of the previously mentioned energy levels. Our results again were not quite consistent with theory within uncertainty, but that transmission curve. While we modeled the as a Maxwell Boltzmann Gaussian distribution, the actual curve is a convolution between the six Lorenztian line profiles and the Gaussian distribution. The uncertainty in the hyperfine fitting  is likely mainly due to the fact that we modeled our frequency scan as linear but it is not actually linear. \end{centering}