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

Impact of Ni-like metastable states and hyperfine quenching on charge state distribution in an EBIT

June 30, 2025

Author(s)

Chowdhury Abrar Faiyaz, Endre Takacs, Timothy Burke, FNU Dipti, Galen O'Neil, Adam Hosier, Hunter Staiger, Joseph Tan, Yuri Ralchenko

We show the effects of ladder ionization and hyperfine quenching on charge state distributions and spectral features of ions in electron beam ion trap (EBIT)

Charge-exchange processes in EBIT: implications for spectral analysis of few-electron Fe ions

April 16, 2025

Author(s)

Yang Yang, FNU Dipti, Amy Gall, Nancy Brickhouse, Hunter Staiger, Galen O'Neil, Paul Szypryt, Adam Foster, David Schultz, Aung Naing, Joseph Tan, Daniel Swetz, Michael Fogle, Randall Smith, Yuri Ralchenko, Endre Takacs

Charge-exchange recombination with neutral atoms significantly influences the ionization balance in electron beam ion traps (EBIT) because its cross section is

High resolution X-ray Spectra of the Time Evolution of Emission from Metastable Electronic States of Highly Charged Ni-like Ions

June 25, 2024

Author(s)

Timothy Burke, Endre Takacs, Dipti Dipti, Adam Hosier, Galen O'Neil, Hunter Staiger, Joseph N. Tan, Aung S. Naing, Joan Marler, Yuri Ralchenko

Metastable levels of highly charged ions that can only decay via highly forbidden transitions can have a significant effect on the properties of high

Observations and identifications of extreme ultraviolet spectra of Ca-like to Na-like neodymium ions using an electron beam ion trap

August 23, 2023

Author(s)

Yang Yang, Dipti Dipti, Chihiro Suzukic, A. C. Gall, R. Silwal, Samuel Sanders, Joseph N. Tan, Aung S. Naing, Endre Takacs, Yuri Ralchenko

Extreme ultraviolet (EUV) radiation from M-shell Ca-like, Nd40+, through Nalike, Nd49+, highly charged ions have been measured at an electron beam ion trap

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

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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 (Assoc)

Research Interests

Publications

Impact of Ni-like metastable states and hyperfine quenching on charge state distribution in an EBIT

Charge-exchange processes in EBIT: implications for spectral analysis of few-electron Fe ions

High resolution X-ray Spectra of the Time Evolution of Emission from Metastable Electronic States of Highly Charged Ni-like Ions

Observations and identifications of extreme ultraviolet spectra of Ca-like to Na-like neodymium ions using an electron beam ion trap

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