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Analysis of E3 Transitions in Ag-like High-Z Ions Observed with the NIST EBIT. ATOMS 2023. [DOI: 10.3390/atoms11030043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023] Open
Abstract
We report measurements and identification of the E3 4f7/2,5/2-5s1/2 transitions and E1 allowed transitions in Ag-like W (Z = 74), Re (Z = 75), and Ir (Z = 77). The spectra were recorded at the NIST EBIT using a grazing-incidence EUV spectrometer. The present measured wavelengths and theoretical predictions using GRASP2K calculations confirm previous observations of the same E3 transitions in Ag-like W. Our collisional–radiative model using the NOMAD code offers an insight into the population kinematics for Ag-like ions of heavy elements. We discuss the observed spectra and comparisons of the measured and simulated spectral lines.
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Dipti, Silwal R, Dreiling JM, Sanders SC, Takacs E, Ralchenko Y. Spectroscopic analysis of N-intrashell transitions in Rb-like to Ni-like Yb ions. JOURNAL OF PHYSICS. B, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS : AN INSTITUTE OF PHYSICS JOURNAL 2020; 53:10.1088/1361-6455/ab8716. [PMID: 38903481 PMCID: PMC11187820 DOI: 10.1088/1361-6455/ab8716] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/22/2024]
Abstract
Extreme ultraviolet spectra of highly-charged ytterbium ions produced in an electron beam ion trap at the National Institute of Standards and Technology were observed with a flat-field grazing incidence spectrometer in the wavelength region of about 4 nm-20 nm. The measured spectra were interpreted through detailed analysis by collisional-radiative modeling of the non-Maxwellian EBIT plasma. Seventy-nine new spectral lines due to intrashell (Δn = 0, n = 4) electric-dipole, magnetic-dipole, and electric-quadrupole transitions were identified in Rb-like Yb33+ through Ni-like Yb42+ ions. The effects of strong configuration interaction within the n = 4 complex on the measured spectra are discussed for a number of ionization stages.
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Affiliation(s)
- Dipti
- National Institute of Standards and Technology, Gaithersburg, MD 20899, United States of America
| | - R Silwal
- National Institute of Standards and Technology, Gaithersburg, MD 20899, United States of America
- Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, United States of America
| | - J M Dreiling
- National Institute of Standards and Technology, Gaithersburg, MD 20899, United States of America
| | - S C Sanders
- National Institute of Standards and Technology, Gaithersburg, MD 20899, United States of America
- Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, United States of America
| | - E Takacs
- National Institute of Standards and Technology, Gaithersburg, MD 20899, United States of America
- Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, United States of America
| | - Yu Ralchenko
- National Institute of Standards and Technology, Gaithersburg, MD 20899, United States of America
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Gall AC, Foster AR, Silwal R, Dreiling JM, Borovik A, Kilgore E, Ajello M, Gillaspy JD, Ralchenko Y, Takács E. EBIT Observation of Ar Dielectronic Recombination Lines near the Unknown Faint X-Ray Feature Found in the Stacked Spectrum of Galaxy Clusters. THE ASTROPHYSICAL JOURNAL 2019; 872:10.3847/1538-4357/ab0177. [PMID: 34795454 PMCID: PMC8596318 DOI: 10.3847/1538-4357/ab0177] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Motivated by possible atomic origins of the unidentified emission line detected at 3.55-3.57 keV in a stacked spectrum of galaxy clusters, an electron beam ion trap (EBIT) was used to investigate the resonant dielectronic recombination (DR) process in highly charged argon ions as a possible contributor to the emission feature. The He-like Ar DR-induced transition 1s22l-1s2l3l' was suggested to produce a 3.62 keV photon near the unidentified line at 3.57 keV and was the starting point of our investigation. The collisional-radiative model NOMAD was used to create synthetic spectra for comparison with both our EBIT measurements and with spectra produced with the AtomDB database/Astrophysical Plasma Emission Code (APEC) used in the Bulbul et al. work. Excellent agreement was found between the NOMAD and EBIT spectra, providing a high level of confidence in the atomic data used. Comparison of the NOMAD and APEC spectra revealed a number of missing features in the AtomDB database near the unidentified line. At an electron temperature of T e = 1.72 keV, the inclusion of the missing lines in AtomDB increases the total flux in the 3.5-3.66 keV energy band by a factor of 2. While important, this extra emission is not enough to explain the unidentified line found in the galaxy cluster spectra.
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Affiliation(s)
- Amy C Gall
- Clemson University, Department of Physics and Astronomy, Clemson, SC 29634-0978, USA
| | - Adam R Foster
- Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
| | - Roshani Silwal
- Clemson University, Department of Physics and Astronomy, Clemson, SC 29634-0978, USA
- National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Joan M Dreiling
- National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Alexander Borovik
- I. Physikalisches Institut, Justus-Liebig-Universität Gießen, D-35392 Giessen, Germany
| | - Ethan Kilgore
- Clemson University, Department of Physics and Astronomy, Clemson, SC 29634-0978, USA
| | - Marco Ajello
- Clemson University, Department of Physics and Astronomy, Clemson, SC 29634-0978, USA
| | - John D Gillaspy
- National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
- National Science Foundation, Alexandria, VA 22314, USA
| | - Yuri Ralchenko
- National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Endre Takács
- Clemson University, Department of Physics and Astronomy, Clemson, SC 29634-0978, USA
- National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
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Energy Levels and Radiative Rates for Transitions in F-like Sc XIII and Ne-like Sc XII and Y XXX. ATOMS 2018. [DOI: 10.3390/atoms6020025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Silwal R, Lapierre A, Gillaspy JD, Dreiling JM, Blundell SA, Dipti, Borovik A, Gwinner G, Villari ACC, Ralchenko Y, Takacs E. Measuring the difference in nuclear charge radius of Xe isotopes by EUV spectroscopy of highly charged Na-like ions. PHYSICAL REVIEW. A 2018; 98:10.1103/PhysRevA.98.052502. [PMID: 32201753 PMCID: PMC7083102 DOI: 10.1103/physreva.98.052502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The difference in the mean-square nuclear charge radius of xenon isotopes was measured utilizing a method based on extreme ultraviolet spectroscopy of highly charged Na-like ions. The isotope shift of the Na-like D1 (3s 2 S 1/2 - 3p 2 P 1/2) transition between the 124Xe and 136Xe isotopes was experimentally determined using the electron-beam ion-trap facility at the National Institute of Standards and Technology. The mass-shift and the field-shift coefficients were calculated with enhanced precision by the relativistic many-body perturbation theory and multiconfiguration Dirac-Hartree-Fock method. The mean-square nuclear charge radius difference was found to be δ〈r 2〉136,124 = 0.269(42) fm2. Our result has smaller uncertainty than previous experimental results and agrees with the literature values.
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Affiliation(s)
- R. Silwal
- Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, USA
- National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA
| | - A. Lapierre
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - J. D. Gillaspy
- National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA
- National Science Foundation, Arlington, Virginia 22314, USA
| | - J. M. Dreiling
- National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA
| | - S. A. Blundell
- University of Grenoble Alpes, CEA, CNRS, INAC-SyMMES, 38000 Grenoble, France
| | - Dipti
- National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA
| | - A. Borovik
- National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA
| | - G. Gwinner
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
| | - A. C. C. Villari
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
| | - Yu. Ralchenko
- National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA
| | - E. Takacs
- Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, USA
- National Institute of Standards and Technology (NIST), Gaithersburg, Maryland 20899, USA
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