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Electron self-energy corrections using the Welton concept for atomic structure calculations. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2022.110644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Hudson L, Cline J, Henins A, Mendenhall M, Szabo C. Contemporary x-ray wavelength metrology and traceability. Radiat Phys Chem Oxf Engl 1993 2020; 167:108392. [PMID: 32489233 PMCID: PMC7266105 DOI: 10.1016/j.radphyschem.2019.108392] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We report recent advances in absolute x-ray wavelength metrology in the context of producing modern standard reference data. Primary x-ray wavelength standards are produced today using diffraction spectrometers using crystal optics arranged to be operated in dispersive and non-dispersive geometries, giving natural-line-width limited profiles with high resolution and accuracy. With current developments, measurement results can be made traceable to the Système internationale definition of the meter by using diffraction crystals that have absolute lattice-spacing provenance through x-ray-optical interferometry. Recent advances in goniometry, innovation of electronic x-ray area detectors, and new in situ alignment and measurement methods now permit robust measurement and quantification of previously-elusive systematic uncertainties. This capability supports infrastructures like the NIST Standard Reference Data programs and the International Initiative on X-ray Fundamental Parameters and their contributions to science and industry. Such data projects are further served by employing complementary wavelength-and energy-dispersive spectroscopic techniques. This combination can provide, among other things, new tabulations of less-intense x-ray lines that need to be identified in x-ray fluorescence investigation of uncharacterized analytes. After delineating the traceability chain for primary x-ray wavelength standards, and NIST efforts to produce standard reference data and materials in particular, this paper posits the new opportunities for x-ray reference data tabulation that modern methods now afford.
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Affiliation(s)
- L.T. Hudson
- National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, 20899, USA
| | - J.P. Cline
- National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, 20899, USA
| | - A. Henins
- National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, 20899, USA
| | - M.H. Mendenhall
- National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, 20899, USA
| | - C.I. Szabo
- National Institute of Standards and Technology (NIST), 100 Bureau Drive, Gaithersburg, MD, 20899, USA
- Theiss Research, 7411 Eads Ave, La Jolla, CA, 92037, USA
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Melia HA, Chantler CT, Smale LF, Illig AJ. The characteristic radiation of copper Kα 1,2,3,4. Acta Crystallogr A Found Adv 2019; 75:527-540. [PMID: 31041908 DOI: 10.1107/s205327331900130x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Accepted: 01/23/2019] [Indexed: 11/10/2022] Open
Abstract
A characterization of the Cu Kα1,2 spectrum is presented, including the 2p satellite line, Kα3,4, the details of which are robust enough to be transferable to other experiments. This is a step in the renewed attempts to resolve inconsistencies in characteristic X-ray spectra between theory, experiment and alternative experimental geometries. The spectrum was measured using a rotating anode, monolithic Si channel-cut double-crystal monochromator and backgammon detector. Three alternative approaches fitted five Voigt profiles to the data: a residual analysis approach; a peak-by-peak fit; and a simultaneous constrained method. The robustness of the fit is displayed across three spectra obtained with different instrumental broadening. Spectra were not well fitted by transfer of any of three prior characterizations from the literature. Integrated intensities, line widths and centroids are compared with previous empirical fits. The novel experimental setup provides insight into the portability of spectral characterizations of X-ray spectra. From the parameterization, an estimated 3d shake probability of 18% and a 2p shake probability of 0.5% are reported.
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Affiliation(s)
| | | | - Lucas F Smale
- School of Physics, University of Melbourne, Australia
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Goyal A, Khatri I, Singh A, Sharma R, Mohan M. X-ray diffraction patterns and diffracted intensity of Kα spectral lines of He-like ions. Radiat Phys Chem Oxf Engl 1993 2017. [DOI: 10.1016/j.radphyschem.2017.04.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Notermans RPMJW, Vassen W. High-precision spectroscopy of the forbidden 2 3s1→2 1p1 transition in quantum degenerate metastable helium. PHYSICAL REVIEW LETTERS 2014; 112:253002. [PMID: 25014808 DOI: 10.1103/physrevlett.112.253002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Indexed: 06/03/2023]
Abstract
We have measured the forbidden 2 (3)S(1)→2 (1)P(1) transition at 887 nm in a quantum degenerate gas of metastable (4)He atoms confined in an optical dipole trap. The determined transition frequency is 338 133 594.4 (0.5) MHz, from which we obtain an ionization energy of the 2 (1)P(1) state of 814 709 148.6 (0.5) MHz. This ionization energy is in disagreement by >3σ with the most accurate quantum electrodynamics calculations available. Our measurements also provide a new determination of the lifetime of the 2 (1)P(1) state of 0.551 (0.004)(stat) ((-0.000)(+0.013))(syst) ns, which is the most accurate determination to date and in excellent agreement with theory.
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Affiliation(s)
- R P M J W Notermans
- LaserLaB, Department of Physics and Astronomy, VU University Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, Netherlands
| | - W Vassen
- LaserLaB, Department of Physics and Astronomy, VU University Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, Netherlands
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A vacuum double-crystal spectrometer for reference-free X-ray spectroscopy of highly charged ions. Radiat Phys Chem Oxf Engl 1993 2014. [DOI: 10.1016/j.radphyschem.2014.01.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Chantler CT, Kinnane MN, Gillaspy JD, Hudson LT, Payne AT, Smale LF, Henins A, Pomeroy JM, Kimpton JA, Takacs E, Makonyi K. Chantler et al. reply. PHYSICAL REVIEW LETTERS 2013; 110:159302. [PMID: 25167322 DOI: 10.1103/physrevlett.110.159302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Indexed: 06/03/2023]
Affiliation(s)
- C T Chantler
- School of Physics, The University of Melbourne, Australia
| | - M N Kinnane
- School of Physics, The University of Melbourne, Australia and National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - J D Gillaspy
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - L T Hudson
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - A T Payne
- School of Physics, The University of Melbourne, Australia
| | - L F Smale
- School of Physics, The University of Melbourne, Australia
| | - A Henins
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - J M Pomeroy
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
| | - J A Kimpton
- School of Physics, The University of Melbourne, Australia and Australian Synchrotron, Melbourne, Victoria 3000, Australia
| | - E Takacs
- Experimental Physics Department, University of Debrecen, Bem ter 18/A, Debrecen 4028, Hungary
| | - K Makonyi
- National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA
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Epp SW. Comment on "Testing three-body quantum electrodynamics with trapped Ti20+ ions: evidence for a Z-dependent divergence between experiment and calculation". PHYSICAL REVIEW LETTERS 2013; 110:159301. [PMID: 25167321 DOI: 10.1103/physrevlett.110.159301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Indexed: 06/03/2023]
Affiliation(s)
- S W Epp
- Max Planck Advanced Study Group, Center for Free-Electron Laser Science, 22607 Hamburg, Germany and Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
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