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

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

A transition-edge sensor-based x-ray spectrometer for the study of highly charged ions at the National Institute of Standards and Technology electron beam ion trap

December 16, 2019

Author(s)

Paul Szypryt, Galen C. O'Neil, Endre Takacs, Joseph N. Tan, Sean W. Buechele, Aung Naing, Douglas A. Bennett, William B. Doriese, Malcolm S. Durkin, Joseph W. Fowler, Johnathon D. Gard, Gene C. Hilton, Kelsey M. Morgan, Carl D. Reintsema, Daniel R. Schmidt, Daniel S. Swetz, Joel N. Ullom, Yuri Ralchenko

We report on the design, commissioning, and initial measurements of a Transition-Edge Sensor (TES) x-ray spectrometer for the Electron Beam Ion Trap (EBIT) at

On Low-Energy Tail Distortions in the Detector Response Function of X-Ray Microcalorimeter Spectrometers

November 21, 2019

Author(s)

Galen C. O'Neil, Paul Szypryt, Endre Takacs, Joseph N. Tan, Sean W. Buechele, Aung Naing, Young I. Joe, Daniel S. Swetz, Daniel R. Schmidt, William B. Doriese, Johnathon D. Gard, Carl D. Reintsema, Joel N. Ullom, John S. Villarrubia, Yuri Ralchenko

We use narrow spectral lines from the X-ray spectra of various highly charged ions to measure low-energy tail-like deviations from a Gaussian response function

Lifetime of the metastable ²P_1/2 state of F-like Ar⁹⁺ isolated in a compact Penning trap

September 6, 2018

Author(s)

Samuel M. Brewer, Joan M. Dreiling, Nicholas D. Guise, Shannon M. Hoogerheide, Aung Naing, Joseph N. Tan

Multiple-ionized atoms can be captured at low energy in a compact Penning trap, allowing the isolation of a single charge state to measure the radiative

View more Publications

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

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

A transition-edge sensor-based x-ray spectrometer for the study of highly charged ions at the National Institute of Standards and Technology electron beam ion trap

On Low-Energy Tail Distortions in the Detector Response Function of X-Ray Microcalorimeter Spectrometers

Lifetime of the metastable ²P_1/2 state of F-like Ar⁹⁺ isolated in a compact Penning trap