Using LLNL's EBIT-I and two Crystal Spectrometers to Search for the Solution to the Iron Emission Problem with Mo XXXIII

POSTER

Abstract

The purpose of this study was to determine the polarization of lines 3C and 3D for Mo XXXIII to further resolve the Fe XVII emission problem. For Ne-like Fe XVII, the 3d to 2p resonance, 3C, and intercombination, 3D, lines are strong and can be used as a diagnostic tool for determining the temperature and resonant scattering of stellar coronae. However, astrophysical and laboratory measurements, as well as calculations for the intensities of lines 3C and 3D do not agree. One factor that could affect laboratory measurements is polarization. Since polarization does not depend on atomic number, Ne-like Mo XXXIII is an excellent surrogate. To find the polarization values, we used LLNL's EBIT-I electron beam ion trap to create, trap, and excite Mo XXXIII. Subsequent x-ray emission was dispersed using two mutually perpendicular, spherically bent Ge crystal spectrometers and detected using CCDs. From our findings, the measured polarization values and theoretical polarization values agree within systematic error bars, but are not equal. Therefore, the intensity ratio of EBIT's measurements in the Fe XVII emission problem may increase by as much as 5{\%}. This work was performed under the auspices of the Department of Energy by LLNL under Contract No. DE-AC52-07NA27344.

Authors

  • Tessie Lumabao

    Hawaii Department of Education - Waipahu High School, Waipahu High School - Department of Education

  • Peter Beiersdorfer

    Lawrence Livermore National Laboratory, Livermore, CA., Lawrence Livermore National Laboratory, LLNL

  • Greg Brown

    Lawrence Livermore National Laboratory, Livermore, CA., Lawrence Livermore National Laboratory

  • Natalie Hell

    Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory

  • Tom Lockard

    Lawrence Livermore National Laboratory

  • C. Jennings

    Stanford University, None, none, Univ of California - Merced, Dr. Remeis-Sternwarte & ECAP, Universität Erlangen-Nürnberg, NASA GSFC, Lawrence Livermore Natl Lab, Lawrence Livermore National Laboratory, Goddard Space Flight Center-NASA, University of Nevada, Reno, Cal Poly - San Luis Obispo, Victoria University of Wellington, Wellington 6021, New Zealand, Penn State, Micron School of Materials Science & Engineering, Department of Physics, Boise State University, Autonomous University of Zacatecas, Micron School of Materials Science & Engineering, Boise State University, Naval Research Laboratory, Independent Researcher, Cornell University, UC Santa Cruz, Middle Georgia State University, University of California, Merced, Stanford University, California, Institute of Medical Biology, Singapore; Stanford University, California, University of California Merced, Kent State University, ORNL, UC Berkeley, LLNL, Physics, Hokkaido University, Japan, Physics, UC San Diego, Physics, California State University, Fresno, Department of Physics and Astronomy, California State University Long Beach, Long Beach, California 90840, USA, Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA, Department of Physics, Southern University of Science and Technology, Shenzen 518055, China, Virginia Tech, Sotera Defense Solutions, Inc., Univ of California - Santa Cruz, College of Staten Island, UC Irvine, Naval Research Laboratory, Washington, DC 20375, Virginia Tech, Blacksburg, VA 24061, University of California, Merced CA 95343