Bulletin of the American Physical Society
Fall 2015 Joint Meeting of the Texas Section of the AAPT, Texas Section of the APS and Zone 13 of the Society of Physics Students
Volume 60, Number 15
Thursday–Saturday, October 29–31, 2015; Waco, Texas
Session F5: SPS II |
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Chair: Vanessa Espinoza, Texas Lutheran University Room: E.231 |
Friday, October 30, 2015 1:30PM - 1:42PM |
F5.00001: Effects of Proton Incident Angle on Neutrino Flux for DUNE Eric Amador The Deep Underground Neutrino Experiment (DUNE) is a project under construction at Fermi Lab with the focus of studying neutrino oscillations through proton-target collisions. Using computer simulations at Fermi Lab, my study will enable me to observe the generation of electron and muon neutrinos. The purpose of my study is to maximize the muon neutrino and minimize the electron neutrino fluxes. This can be achieved by applying an incident angle on the proton beam and observe the parent pions which decay into neutrino particles. Future results will allow DUNE group members to run experiments more efficiently with lowered background noise. [Preview Abstract] |
Friday, October 30, 2015 1:42PM - 1:54PM |
F5.00002: Raman imaging of MoS$_{2}$ Hongyuan Li, Dmitri Voronine, Alexander Sinyukov, Zhenrong Zhang, Alexei Sokolov, Marlan Scully Molybdenum disulfide is an important type of metal dichalcogenide which is of great significance in chemical and electronic engineering. The monolayer MoS2 can be made into transistor or biosensor. Its nano-structure has interesting properties. Here, we report Raman imaging of MoS2 nanoflakes using 785 nm laser excitation and find that the intensity near the edge of the flake is higher than in the center. This peculiar characteristic is analyzed and compared to the results of resonant Raman(RR) imaging using 660nm laser excitation. Second-order peaks emerge in the RR map. We compare the results obtained by non-resonant and resonant Raman techniques.Our results can help improving the understanding of the 2D nanostructures and develop new applications. abstract body. [Preview Abstract] |
Friday, October 30, 2015 1:54PM - 2:06PM |
F5.00003: Raman Spectroscopy and Microscopy of Chocolate Siyu He, Dmitri Voronine, Alex Sinyukov, Alexei Sokolov, Hongyuan Li, Marlan Scully Raman spectroscopy is an advanced technology for the chemical substance analysis. We assess the application of both Raman microspectroscopy and handheld Raman spectrometry to the analysis of white and dark chocolate. We analyze the ingredients in each type of chocolate, characterize polymorphs and discuss phase transitions of cocoa butter from the constituent vibrational bands. We distinguish different ingredients from the Raman spectra and measure the crystalline states of the cocoa butter in chocolate. Raman spectroscopy and microscopy can reveal the chocolate quality in food science [Preview Abstract] |
Friday, October 30, 2015 2:06PM - 2:18PM |
F5.00004: Observation of classical and quantum coupling via tip-enhanced resonant Raman scattering. Yingchao Zhang Nano-scale optical analysis of several layers MoS2 is demonstrated with spatial resolution of 20 nm by tip-enhanced Raman spectroscopy (TERS). We analyze different optical signatures at the edges and near the center of the MoS2 flakes. With controlling the tip-sample distance with subnanometer precision by atomic force, we explore the unique distance dependence behavior of the tip enhancement. We observe the transition from the classical near-field coupling to the quantum coupling regime. At subnanometer length range, TERS enhancement is significantly reduced, due to tunneling quantum effects. [Preview Abstract] |
Friday, October 30, 2015 2:18PM - 2:30PM |
F5.00005: Spectroscopic Analysis of Doped Metal Nanoclusters Vanessa Espinoza, Douglas Kauffman A variety of metal-doped gold nanoclusters that were approximately 2 nm in size were studied using photoluminescence and absorption spectroscopy, so that optical properties could be better examined. In addition to examining differences between compositions, the nanoclusters were also compared at liquid nitrogen temperature and room temperature. All nanoclusters had emission peaks that were significantly different from one another at liquid nitrogen temperature. The shifts of the emission spectras when looking at composition and temperature change have lead to the proposed idea that the florescence of gold nanoparticles \textasciitilde 2nm in size are composition and temperature dependent. A difference in the emission and excitation energy leads to the indication that an addition source of energy transfer as the electron relaxes back to ground has to occur in order for the electron to reach ground state. We hypothesize that vibrational transitions make up for the change in energy that is occurring and these pathways may a result of the vibrations of the ligand shells on the nanoparticles. Different dopants and temperatures affect the amount of constriction that is being placed on these ligands and this is a possible explanation for the change in florescence that was observed. Overall, this experimentation allows for better understanding as to how the manipulation of these nanoparticles can be done in order to modify and tailor particles so it may be implemented in a variety of desired applications. [Preview Abstract] |
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