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Demonstration Of Fluorescence Near the K-Absorption Edge in Back-Reflection Laue

POSTER

Abstract

In Laue diffraction, the bremsstrahlung x-ray spectrum is used to obtain a diffraction image of a sample on the atomic scale. When using the bremsstrahlung beam on a sample, the sample may fluoresce which will hurt the contrast of the Laue diffraction image, however this phenomena can also be utilized in fields such as x-ray spectroscopy. The interaction between a sample material and incoming x-rays is specific to the sample material as every element has a unique absorption vs energy relationship and k-absorption edge. Different x-ray energies around the sample's absorption edge will result in the sample releasing a different flux of photons as it fluoresces. Changing the incoming x-ray intensity by changing the filament current, the energies of the x-rays are consistent, however the magnitude of fluorescence will change. Changing the voltage of the x-ray source will change this energy distribution and the intensity of the bremsstrahlung beam. In this poster, back-reflection Laue is used to capture the fluorescence of molybdenum (Mo), antimony (Sb), and silver (Ag) about their absorption edges at different x-ray source current and voltages.

Authors

  • Nicholas Summerfield

    University Of Houston

  • Eric Davis

    University of Texas at Arlington, Sultan Qaboos University, UTA HEP group, Department of Integrated Bio \& Nano Systems, University of Houston, Houston, TX 77204, USA, Department of Electrical and Computer Engineering, Nano Tech Center, Texas Tech University, University of Michigan, University of Waerloo, Canada, Texas Tech University, Dept of Mechanical Eng, TTU; Dept. of Physics and Astronomy, TTU, Dept of Cell Biology and Biochemistry, TTU Health Sci Ctr, Dept of Physics and Astronomy, TTU, Dept of Mechanical Engineering, TTU, Dept of Physics and Astronomy, TTU; Sch of Health and Sci, Purdue Univ, Dept of Mathematical and Systems Engineering, Shizuoka Univ, Department of Physics, University of Texas at Dallas, Richardson, TX 75080, Department of Physics, University of Texas at Dallas, Richardson, TX 75080., LeTourneau University, None, University of Waterloo, Canada, Texas Tech Univ, Trinity University, the University of Texas at Dallas, Texas Tech University, Lubbock, TX, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada, University of Dallas, Liverpool John Moores University, University Of Houston, Biolog Department, TCU, Home Schooled high school student, Los Alamos National Laboratory