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Title: Measurement of electron impact collisional excitation cross sections of Ni to Ge-like gold

We have measured the collisional excitation cross sections for the 3d→4f and 3d→5f excitations in Au ions near the Ni-like charge state by using beam plasmas created in the Livermore electron beam ion trap EBIT-I. The cross sections have been experimentally determined at approximately 1, 2 and 3 keV above the threshold energy, ET, for the 3d→4f excitations (ET ~2.5 keV) and at approximately 0.1, 1 and 2 keV above the threshold energy for the 3d→5f excitations (ET ~3.3 keV). The cross section measurements were made possible by using the GSFC x-ray microcalorimeter at the Livermore EBIT facility. The absolute cross sections are determined from the ratio of the intensity of the collisionally excited bound-bound transitions to the intensity of the radiative recombination lines produced in EBIT-I plasmas. The effects of polarization and Auger decay channels are accounted for in the cross section determination. Measured cross sections are compared with those from HULLAC, DWS and FAC calculations. Finally, the measurements demonstrate that some errors exist in the calculated excitation cross sections.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [3]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-647513
Journal ID: ISSN 0094-243X; TRN: US1700661
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1811; Journal ID: ISSN 0094-243X
Publisher:
American Institute of Physics (AIP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; electron impact excitation cross sections; gold M-shell; microcalorimeter; EBIT
OSTI Identifier:
1351130

May, M. J., Beiersdorfer, P., Jordan, N., Scofield, J. H., Reed, K. J., Brown, G. V., Hansen, S. B., Porter, F. S., Kelley, R., Kilbourne, C. A., and Boyce, K. R.. Measurement of electron impact collisional excitation cross sections of Ni to Ge-like gold. United States: N. p., Web. doi:10.1063/1.4975752.
May, M. J., Beiersdorfer, P., Jordan, N., Scofield, J. H., Reed, K. J., Brown, G. V., Hansen, S. B., Porter, F. S., Kelley, R., Kilbourne, C. A., & Boyce, K. R.. Measurement of electron impact collisional excitation cross sections of Ni to Ge-like gold. United States. doi:10.1063/1.4975752.
May, M. J., Beiersdorfer, P., Jordan, N., Scofield, J. H., Reed, K. J., Brown, G. V., Hansen, S. B., Porter, F. S., Kelley, R., Kilbourne, C. A., and Boyce, K. R.. 2017. "Measurement of electron impact collisional excitation cross sections of Ni to Ge-like gold". United States. doi:10.1063/1.4975752. https://www.osti.gov/servlets/purl/1351130.
@article{osti_1351130,
title = {Measurement of electron impact collisional excitation cross sections of Ni to Ge-like gold},
author = {May, M. J. and Beiersdorfer, P. and Jordan, N. and Scofield, J. H. and Reed, K. J. and Brown, G. V. and Hansen, S. B. and Porter, F. S. and Kelley, R. and Kilbourne, C. A. and Boyce, K. R.},
abstractNote = {We have measured the collisional excitation cross sections for the 3d→4f and 3d→5f excitations in Au ions near the Ni-like charge state by using beam plasmas created in the Livermore electron beam ion trap EBIT-I. The cross sections have been experimentally determined at approximately 1, 2 and 3 keV above the threshold energy, ET, for the 3d→4f excitations (ET ~2.5 keV) and at approximately 0.1, 1 and 2 keV above the threshold energy for the 3d→5f excitations (ET ~3.3 keV). The cross section measurements were made possible by using the GSFC x-ray microcalorimeter at the Livermore EBIT facility. The absolute cross sections are determined from the ratio of the intensity of the collisionally excited bound-bound transitions to the intensity of the radiative recombination lines produced in EBIT-I plasmas. The effects of polarization and Auger decay channels are accounted for in the cross section determination. Measured cross sections are compared with those from HULLAC, DWS and FAC calculations. Finally, the measurements demonstrate that some errors exist in the calculated excitation cross sections.},
doi = {10.1063/1.4975752},
journal = {AIP Conference Proceedings},
number = ,
volume = 1811,
place = {United States},
year = {2017},
month = {3}
}