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You searched on: Author: joseph tan Sorted by: date

Displaying records 1 to 10 of 46 records.
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1. Tests of Theory in Rydberg States of One-electron Ions
Published: 7/1/2014
Authors: Joseph N Tan, Peter J Mohr
Abstract: Comparison of optical frequency measurements to predictions of quantum electrodynamics (QED) for Rydberg states of one-electron ions can test theory and allow new determinations of constants of nature to be made. Simplifications in the QED theory of ...

2. Testing Three-body Quantum Electrodynamics with Trapped Ti-20 Ions: Evidence for a Z-Dependent Divergence between Experiment and Calculation
Published: 10/10/2012
Authors: Lawrence T Hudson, C T Chantler, Mark N. Kinnane, John D Gillaspy, A.T. Payne, L F Smale, Albert Henins, Joseph N Tan, J A Kimpton, E Takacs, K Makonyi, Joshua M Pomeroy
Abstract: We report the measurement of the w (1s2p 1P1 ! 1s2 1S0) resonance line transition energy in helium-like titanium. Our result, 4749.85(7) eV, deviates from the most recent ab initio prediction by three times our experimental uncertainty and by many ...

3. Absolute transition frequencies and quantum interference in a frequency comb based measurement of the 6,7Li D lines
Published: 7/6/2011
Authors: Craig J Sansonetti, Clayton Simien, John D Gillaspy, Joseph N Tan, Samuel Middleton Brewer, Roger C Brown, Saijun Wu, James V Porto
Abstract: Optical frequencies of the D lines of 6,7Li were measured with a relative accuracy of 5x10-11 using an optical comb synthesizer. Quantum interference in the laser induced fluorescence for the partially-resolved D2 lines was found to produce polariz ...

4. Experiment at NIST towards one-electron ions in circular Rydberg states
Published: 6/20/2011
Authors: Joseph N Tan, Samuel Middleton Brewer, Nicholas D. Guise
Abstract: An experimental effort is underway at NIST to enable tests of theory with oneelectron ions synthesized in circular Rydberg states from captured bare nuclei. Problematic effects which limit the accuracy of predicted energy levels for low-lying state ...

5. Fe xvii X-ray Line Ratios for Accurate Astrophysical Plasma Diagnostics
Published: 2/20/2011
Authors: John D Gillaspy, E. H. Silver, L. Tedesco, Joseph N Tan, Joshua M Pomeroy, J M Laming, G.-X. Chen, T. Lin
Abstract: New laboratory measurements of the Ne-like Fe xvii x-ray lines in the 15-17 Angstrom range are presented, along with new theoretical predictions. These results establish consistency between independent laboratories and opens the door to trustworthy ...

6. EUV Spectral Lines of Highly-Charged Hf, Ta and Au Ions Observed with an Electron Beam Ion Trap
Published: 1/12/2011
Authors: Ilija Draganic, Yuri Ralchenko, Joseph Reader, John D Gillaspy, Joseph N Tan, Joshua M Pomeroy, Samuel Middleton Brewer, Dmitry D. Osin
Abstract: Extreme ultraviolet spectra of highly charged hafnium, tantalum, and gold were produced with an electron beam ion trap (EBIT) at the National Institute of Standards and Technology (NIST) and recorded with a flat-field grazing-incidence spectrometer i ...

7. Progress at NIST in measuring the D-lines of Li isotopes using an optical frequency comb
Published: 12/20/2010
Authors: Clayton Simien, Samuel Middleton Brewer, Joseph N Tan, John D Gillaspy, Craig J Sansonetti
Abstract: Precise spectroscopic experiments with light atoms can provide information about nuclear properties that are very difficult to obtain in electron scattering experiments. For example, relative nuclear radii of low-Z isotopes can be determined accurat ...

8. X-Ray Spectroscopy of Highly Charged Ions in Laboratory and Astrophysical Plasmas
Published: 9/1/2010
Authors: E. H. Silver, N S Brickhouse, T. Lin, G X Chen, K. Kirby, John D Gillaspy, Joseph N Tan, J M Laming
Abstract: This paper presents (1) new laboratory data on the x-ray spectra of He-like Ar XVII over a broad spectral range (300-3500 eV) at high resolution (2) the results of new measurements of K-shell x- ray reference lines in carbon, oxygen, iron, copper, an ...

9. Fundamental constants and tests of theory in Rydberg states of one-electron ions
Published: 3/19/2010
Authors: Ulrich D. Jentschura, Peter J Mohr, Joseph N Tan
Abstract: The nature of the theory of circular Rydberg states of hydrogenlike ions allows highly-accurate predictions to be made for energy levels. In particular, uncertainties arising from the problematic nuclear size correction which beset low angular-momen ...

10. Measurement of the D Line Doublet in High-Z Highly-Charged Sodium-like Ions
Published: 7/8/2009
Authors: John D Gillaspy, Ilija Draganic, Yuri Ralchenko, Joseph Reader, Joseph N Tan, Joshua M Pomeroy, Samuel Middleton Brewer
Abstract: We report a direct observation of the D line doublet of sodium-like ions with Z{greater than or equal to}72. Spectra in the 1 nm to 9 nm spectral range are presented showing the widely split doublet for Hf61+, Ta62+, W63+,and Au68+. The ions were pro ...

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