Joseph N. Tan

Staff Employment

2003-Present, Staff Physicist, NIST, Gaithersburg, MD
1998-2002, Harvard Research Associate, ATRAP Collaboration, Center for European Nuclear Research (CERN), Highlight: Background-free observation of cold antihydrogen production and the first glimpse of its internal states
1996-1997, Scientist, Frequency and Time Systems, Datum Corp.
1994-1995, Colorado State University Fellow, NIST, Boulder, Highlight: Bragg diffraction from crystallized ion plasmas, Science 279, p.686-689 (1998).
1992-1994, JILA Fellow, National Institute of Standards and Technology, Boulder

Staff Education

1992, Ph.D. Physics, Harvard University, Thesis Title: "Cooperative Behavior in Cavity-cooled, Parametrically-pumped Electron Oscillators" (a finalist of the first DAMOP Thesis award)
1986, M.S. Physics, University of Washington, Seattle
1985-1986, University of Washington Arts and Sciences Fellow
1984-1985, Instructor I, University of the Philippines, Diliman
1983, B.S. Physics, University of the Philippines, Diliman

Publications

Determination of electron beam energy in measuring the electron-impact ionization cross section of He-like Fe24+

March 17, 2023

Author(s)

Yuri Ralchenko, Galen O'Neil, Paul Szypryt, Joseph N. Tan, Aung S. Naing, Yang Yang, Dipti Dipti, Amy Gall, Adam Hosier, David Schultz, Randall Smith, Nancy Brickhouse, Endre Takacs

In an effort to measure electron-impact ionization (EII) cross sections of He-like $Fe^24+}$ at the electron beam ion trap (EBIT) facility of the National

Background and blended spectral line reduction in precision spectroscopy of EUV and x-ray transitions in highly charged ions

March 3, 2023

Author(s)

Yuri Ralchenko, Joseph N. Tan, Aung S. Naing, Galen O'Neil, Paul Szypryt, Dipti Dipti, Grant Mondeel, Roshani Silwal, Alain Lapierre, Steven Blundell, Gerald Gwinner, Antonio Camargo Villari, Endre Takacs

We report a method in EBIT spectral analysis that reduces signal from contaminant lines of 1 known or unknown origin. We utilize similar ion charge

Analysis of E3 Transitions in Ag-like High-Z Ions Observed with the NIST EBIT

March 1, 2023

Author(s)

Yuri Ralchenko, David La Mantia, Aung S. Naing, Paul Szypryt, Joseph N. Tan, Endre Takacs, Dipti Dipti, Yang Yang, Adam Hosier, Hunter Staiger

We report measurements and identification of the E3 4f$_7/2,5/2}$-5s$_1⁄2$ transitions and E1 allowed transitions in Ag-like W (Z=74), Re (Z=75), and Ir (Z=77)

Identifications of extreme ultraviolet spectra of Br-like to Ni-like neodymium ions using an electronbeam ion trap

April 30, 2021

Author(s)

C. Suzuki, Dipti Goyal, Y. Yang, A. Gall, Roshani Silwal, S. Sanders, Aung S. Naing, Joseph N. Tan, Endre A. Takacs, Yuri Ralchenko

Charge-resolved extreme ultraviolet spectra of open N-shell neodymium (Nd) ions have been recorded in an electron beam ion trap facility at the National

Measurement of the 2P1/2–2P3/2 fine structure splitting in fluorine-like Kr, W, Re, Os and Ir

September 2, 2020

Author(s)

Galen O'Neil, Samuel C. Sanders, Paul Szypryt, Dipti Goyal, Amy Gall, Yang Yang, Samuel M. Brewer, W.Bertrand (Randy) Doriese, Joseph Fowler, Daniel Swetz, Joseph N. Tan, Joel Ullom, Andrey V. Volotka, Endre Takacs, Yuri Ralchenko

Quantum electrodynamics (QED) is currently considered to be one of the most accurate theories of fundamental interactions. As its extraordinary precision offers

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Staff Employment

2003-Present, Staff Physicist, NIST, Gaithersburg, MD
1998-2002, Harvard Research Associate, ATRAP Collaboration, Center for European Nuclear Research (CERN), Highlight: Background-free observation of cold antihydrogen production and the first glimpse of its internal states
1996-1997, Scientist, Frequency and Time Systems, Datum Corp.
1994-1995, Colorado State University Fellow, NIST, Boulder, Highlight: Bragg diffraction from crystallized ion plasmas, Science 279, p.686-689 (1998).
1992-1994, JILA Fellow, National Institute of Standards and Technology, Boulder

Staff Education

1992, Ph.D. Physics, Harvard University, Thesis Title: "Cooperative Behavior in Cavity-cooled, Parametrically-pumped Electron Oscillators" (a finalist of the first DAMOP Thesis award)
1986, M.S. Physics, University of Washington, Seattle
1985-1986, University of Washington Arts and Sciences Fellow
1984-1985, Instructor I, University of the Philippines, Diliman
1983, B.S. Physics, University of the Philippines, Diliman

Joseph N. Tan (Fed)

Research Interests

Publications

Determination of electron beam energy in measuring the electron-impact ionization cross section of He-like Fe24+

Background and blended spectral line reduction in precision spectroscopy of EUV and x-ray transitions in highly charged ions

Analysis of E3 Transitions in Ag-like High-Z Ions Observed with the NIST EBIT

Identifications of extreme ultraviolet spectra of Br-like to Ni-like neodymium ions using an electronbeam ion trap

Measurement of the 2P1/2–2P3/2 fine structure splitting in fluorine-like Kr, W, Re, Os and Ir