Gillian Nave
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View article: Laboratory confirmation and improved accuracy of 4f and 5d energy levels of Fe <scp>ii</scp> previously identified from stellar spectra
Laboratory confirmation and improved accuracy of 4f and 5d energy levels of Fe <span>ii</span> previously identified from stellar spectra Open
Many energy levels of singly ionized iron (Fe ii, $Z=26$) remain uncertain or experimentally unknown. Their identification and spectral line data are required in reliable astrophysical spectral analyses. In motivation for improving the ato…
View article: Laboratory confirmation and improved Accuracy of 4f and 5d energy levels of Fe II previously identified from stellar spectra
Laboratory confirmation and improved Accuracy of 4f and 5d energy levels of Fe II previously identified from stellar spectra Open
Many energy levels of singly ionised iron (Fe II, $Z=26$) remain uncertain or experimentally unknown. Their identification and spectral line data are required in reliable astrophysical spectral analyses. In motivation for improving the ato…
View article: Branching Fractions and Transition Probabilities for UV Transitions in the Spectrum of Cr ii
Branching Fractions and Transition Probabilities for UV Transitions in the Spectrum of Cr ii Open
We present transition probabilities for 268 spectral lines of singly ionized chromium (Cr ii ) in the wavelength region 208–414 nm. Branching fractions were measured in archival Fourier transform spectra of chromium-argon and chromium-neon…
View article: Wavelengths and Energy Levels of the Upper Levels of Singly Ionized Nickel (Ni ii) from 3d <sup>8</sup>(<sup>3</sup> F)5f to 3d <sup>8</sup>(<sup>3</sup> F)9s
Wavelengths and Energy Levels of the Upper Levels of Singly Ionized Nickel (Ni ii) from 3d <sup>8</sup>(<sup>3</sup> F)5f to 3d <sup>8</sup>(<sup>3</sup> F)9s Open
Using high-resolution spectra of Ni ii recorded using Fourier transform (FT) spectroscopy of continuous, nickel–helium hollow cathode discharge sources in the region 143–5555 nm (1800–70,000 cm −1 , the analysis of 1016 Ni ii lines confirm…
View article: New Ritz wavelengths and transition probabilities for parity-forbidden, singly ionized nickel [Ni <scp>ii</scp>] lines of astrophysical interest
New Ritz wavelengths and transition probabilities for parity-forbidden, singly ionized nickel [Ni <span>ii</span>] lines of astrophysical interest Open
We report accurate Ritz wavelengths for parity-forbidden [Ni ii] transitions, derived from energy levels determined using high-resolution Fourier transform spectroscopy. Transitions between the 18 lowest Ni ii energy levels of even-parity …
View article: Wavelengths and Energy Levels of Singly Ionized Nickel (Ni ii) Measured Using Fourier Transform Spectroscopy
Wavelengths and Energy Levels of Singly Ionized Nickel (Ni ii) Measured Using Fourier Transform Spectroscopy Open
High-resolution spectra of singly ionized nickel (Ni ii ) have been recorded using Fourier transform spectroscopy in the region 143–5555 nm (1800–70,000 cm −1 ) with continuous, nickel–helium hollow cathode discharge sources. An extensive …
View article: Hyperfine Structure Constants of Sc i and Sc ii with Fourier Transform Spectroscopy
Hyperfine Structure Constants of Sc i and Sc ii with Fourier Transform Spectroscopy Open
We report new experimental hyperfine structure (HFS) constants of neutral and singly ionized scandium (Sc i and Sc ii ). We observed spectra of Sc–Ar and Sc–Ne hollow cathode discharges in the region 200–2500 nm (50,000–4000 cm −1 ) using …
View article: New Ritz Wavelengths and Transition Probabilities of Parity-forbidden [Mn II] Lines of Astrophysical Interest
New Ritz Wavelengths and Transition Probabilities of Parity-forbidden [Mn II] Lines of Astrophysical Interest Open
We report a comprehensive list of accurate Ritz wavelengths and calculated transition probabilities for parity-forbidden [Mn ii ] lines. Ritz wavelengths have been derived from experimentally established energy level values resulting from …
View article: The Spectrum and Term Analysis of Singly Ionized Manganese
The Spectrum and Term Analysis of Singly Ionized Manganese Open
An extensive analysis of the Mn spectrum was carried out using high-resolution Fourier transform (FT) and grating spectroscopy of Mn–Ne and Mn–Ar hollow cathode discharge sources, over the range 82–5500 nm (1820–121,728 cm −1 ). Spectral w…
View article: Reference wavelengths of Si <scp>ii</scp>, C <scp>ii</scp>, Fe <scp>i</scp>, and Ni <scp>ii</scp> for quasar absorption spectroscopy
Reference wavelengths of Si <span>ii</span>, C <span>ii</span>, Fe <span>i</span>, and Ni <span>ii</span> for quasar absorption spectroscopy Open
Wavelengths of absorption lines in the spectra of galaxies along the line of sight to distant quasars can be used to probe the variablility of the fine structure constant, α, at high redshifts, provided that the laboratory wavelengths are …
View article: Reference wavelengths of Si II, C II, Fe I, and Ni II
Reference wavelengths of Si II, C II, Fe I, and Ni II Open
Wavelengths of absorption lines in the spectra of galaxies along the line-of-sight to distant quasars can be used to probe the variablility of the fine structure constant, $α$, at high redshifts, provided that the laboratory wavelengths ar…
View article: Atomic data for astrophysics: Needs and challenges
Atomic data for astrophysics: Needs and challenges Open
peer reviewed
View article: Astro2020: Decadal Survey on Astronomy and Astrophysics : State of the Profession Considerations for Laboratory Astrophysics
Astro2020: Decadal Survey on Astronomy and Astrophysics : State of the Profession Considerations for Laboratory Astrophysics Open
International audience
View article: Perspectives on Astrophysics Based on Atomic, Molecular, and Optical (AMO) Techniques
Perspectives on Astrophysics Based on Atomic, Molecular, and Optical (AMO) Techniques Open
About two generations ago, a large part of AMO science was dominated by experimental high energy collision studies and perturbative theoretical methods. Since then, AMO science has undergone a transition and is now dominated by quantum, ul…
View article: Perspectives on Astrophysics Based on Atomic, Molecular, and Optical\n (AMO) Techniques
Perspectives on Astrophysics Based on Atomic, Molecular, and Optical\n (AMO) Techniques Open
About two generations ago, a large part of AMO science was dominated by\nexperimental high energy collision studies and perturbative theoretical\nmethods. Since then, AMO science has undergone a transition and is now\ndominated by quantum,…
View article: Fourier-transform-spectroscopic photoabsorption cross sections and oscillator strengths for the S2 BΣu−3−XΣg−3 system
Fourier-transform-spectroscopic photoabsorption cross sections and oscillator strengths for the S2 BΣu−3−XΣg−3 system Open
Photoabsorption cross sections and oscillator strengths for the strong, predissociating vibrational bands, v ≥ 11, in the S2 BΣu−3−XΣg−3(v,0) system are reported. Absorption measurements were undertaken on S2 vapor produced by a radio-freq…
View article: Measurements of branching fractions using Fourier transform and grating spectroscopy
Measurements of branching fractions using Fourier transform and grating spectroscopy Open
The measurement of lifetimes using laser-induced fluorescence at the University of Wisconsin-Madison has been one of the most productive experiments in the measurement of atomic spectroscopic data. The NIST bibliographic database on Atomic…
View article: Vanadium Transitions in the Spectrum of Arcturus
Vanadium Transitions in the Spectrum of Arcturus Open
We derive a new abundance for vanadium in the bright, mildly metal-poor red giant Arcturus. This star has an excellent high-resolution spectral atlas and well-understood atmospheric parameters, and it displays a rich set of neutral vanadiu…
View article: Wavelength References For The Calibration Of Astronomical Telescopes
Wavelength References For The Calibration Of Astronomical Telescopes Open
"Thorium-argon hollow cathode lamps have long been used for wavelength calibration of spectrographs on ground-based astronomical telescopes. New high-resolution spectrographs, covering wavelengths up through the infrared \nregion, requirin…
View article: Evaluation of resolution and periodic errors of a flatbed scanner used for digitizing spectroscopic photographic plates
Evaluation of resolution and periodic errors of a flatbed scanner used for digitizing spectroscopic photographic plates Open
We evaluated the use of a commercial flatbed scanner for digitizing photographic plates used for spectroscopy. The scanner has a bed size of 420 mm by 310 mm and a pixel size of about 0.0106 mm. Our tests show that the closest line pairs t…
View article: The Cu II Spectrum
The Cu II Spectrum Open
New wavelength measurements in the vacuum ultraviolet (VUV), ultraviolet and visible spectral regions have been combined with available literature data to refine and extend the description of the spectrum of singly ionized copper (Cu II). …
View article: Comprehensive atomic wavelengths, energy levels, and hyperfine structure for singly ionized iron-group elements
Comprehensive atomic wavelengths, energy levels, and hyperfine structure for singly ionized iron-group elements Open
We summarize recent work at the National Institute of Standards and Technology and Imperial College London on wavelengths, hyperfine structure, energy levels, and analysis of singly ionized iron-group elements of astrophysical interest.
View article: IMPROVED Cr ii log(gf) VALUES AND ABUNDANCE DETERMINATIONS IN THE PHOTOSPHERES OF THE SUN AND METAL-POOR STAR HD 84937
IMPROVED Cr ii log(gf) VALUES AND ABUNDANCE DETERMINATIONS IN THE PHOTOSPHERES OF THE SUN AND METAL-POOR STAR HD 84937 Open
New emission branching fraction (BF) measurements for 183 lines of the second spectrum of chromium (Cr ii ) and new radiative lifetime measurements from laser-induced fluorescence for 8 levels of Cr + are reported. The goals of this study …
View article: Fundamental Physics from Observations of White Dwarf Stars
Fundamental Physics from Observations of White Dwarf Stars Open
Variation in fundamental constants provide an important test of theories of grand unification. Potentially, white dwarf spectra allow us to directly observe variation in fundamental constants at locations of high gravitational potential. W…
View article: Hyperfine structure constants for singly ionized manganese (Mn ii) using Fourier transform spectroscopy
Hyperfine structure constants for singly ionized manganese (Mn ii) using Fourier transform spectroscopy Open
We expand on the comprehensive study of hyperfine structure (HFS) in Mn II conducted by Holt et al. (1999) by verifying hyperfine magnetic dipole constants (A) for 20 levels previously measured by Holt et al. (1999) and deriving A constant…
View article: Atomic and Molecular Data: Division B / Commission 14
Atomic and Molecular Data: Division B / Commission 14 Open
Commission 14 has been operating for almost a century. It was one of the 32 Standing IAU Commissions and established in 1919. The main purpose of Commission 14 is to foster interactions between the astronomical community and those conducti…
View article: Atomic Data: Division B / Commission 14 / Working Group Atomic Data
Atomic Data: Division B / Commission 14 / Working Group Atomic Data Open
This report summarizes laboratory measurements of atomic wavelengths, energy levels, hyperfine and isotope structure, energy level lifetimes, and oscillator strengths. Theoretical calculations of lifetimes and oscillator strengths are also…
View article: DIVISION B COMMISSION 14 WORKING GROUP: ATOMIC DATA
DIVISION B COMMISSION 14 WORKING GROUP: ATOMIC DATA Open
This report summarizes laboratory measurements of atomic wavelengths, energy levels, hyperfine and isotope structure, energy level lifetimes, and oscillator strengths. Theoretical calculations of lifetimes and oscillator strengths are also…
View article: DIVISION B COMMISSION 14: ATOMIC AND MOLECULAR DATA
DIVISION B COMMISSION 14: ATOMIC AND MOLECULAR DATA Open
The main purpose of Commission 14 is to foster interactions between the astronomical community and those conducting research on atoms, molecules, and solid state particles to provide data vital to reducing and analysing astronomical observ…
View article: Improved wavelengths of Fe V and Ni V for analysis of spectra of white dwarf stars
Improved wavelengths of Fe V and Ni V for analysis of spectra of white dwarf stars Open
We summarize measurements of improved wavelengths of Fe V and Ni V in the vacuum ultraviolet.