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Controlling atomistic processes on Pb films via quantum size effects and lattice rotation
The two main techniques used to record the data in this dissertation were Spot Profile Analysis - Low Energy Electron Diffraction (SPA-LEED) and Scanning Tunneling Microscopy (STM). A specific data analysis technique for LEED data called G(S) curves is described in depth. G(S) curves can provide a great deal of structural information about the surface; including step heights, island size, and island separation. The effects of quantum size effects (QSE) on the diffusion and critical island sizes of Pb and In on Pb #12;films are reported. Pb depositions on the 2D In phases {radical}3 and {radical}31 to see how the phases affect the Pb growth and its strong QSE are reported.
Date:
June 14, 2012
Creator:
Binz, Steven
System:
The UNT Digital Library
Scanning angle Raman spectroscopy: Investigation of Raman scatter enhancement techniques for chemical analysis
This thesis outlines advancements in Raman scatter enhancement techniques by applying evanescent fields, standing-waves (waveguides) and surface enhancements to increase the generated mean square electric field, which is directly related to the intensity of Raman scattering. These techniques are accomplished by employing scanning angle Raman spectroscopy and surface enhanced Raman spectroscopy. A 1064 nm multichannel Raman spectrometer is discussed for chemical analysis of lignin. Extending dispersive multichannel Raman spectroscopy to 1064 nm reduces the fluorescence interference that can mask the weaker Raman scattering. Overall, these techniques help address the major obstacles in Raman spectroscopy for chemical analysis, which include the inherently weak Raman cross section and susceptibility to fluorescence interference.
Date:
March 14, 2013
Creator:
Meyer, Matthew W.
System:
The UNT Digital Library
Thick Nano-Crystalline Diamond films for fusion applications
None
Date:
July 14, 2010
Creator:
Dawedeit, C
System:
The UNT Digital Library
Toward Understanding Dynamic Annealing Processes in Irradiated Ceramics
None
Date:
January 14, 2013
Creator:
Myers, M. T.
System:
The UNT Digital Library