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Search Publications by: Gillian Nave (Assoc)

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Displaying 1 - 25 of 78

Branching Fractions and Transition Probabilities for UV Transitions in the Spectrum of Cr II

November 28, 2023
Author(s)
Jacob Ward, Jacqueline Li, Jared Schwartz, Gillian Nave, Ton Raassen, Peter H. M. Uylings
We present transition probabilities for 268 spectral lines of singly-ionized chromium (Cr II) in the wavelength region 208 nm to 414 nm. Branching fractions were measured in archival Fourier transform spectra of chromium-argon and chromium-neon hollow

New Ritz Wavelengths and Transition Probabilities for Parity-Forbidden, Singly Ionised Nickel [Ni ii] Lines of Astrophysical Interest Christian P.

December 12, 2022
Author(s)
Christian P. Clear, Peter Uylings, Ton Raassen, Gillian Nave, Juliet C. Pickering
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 17 lowest Ni ii energy levels of even parity produced Ritz

Atomic Transition Probabilities for DyI and DyII

October 12, 2021
Author(s)
M E. Wickliffe, James E. Lawler, Gillian Nave
Atomic transition probabilities for 915 spectral lines of neutral and singly ionized dysprosium are reported. Typical uncertainties are less than +/- 10%. Branching fractions, measured using the 1.0 m Fourier transform spectrometer (FTS) at the National

The Spectrum and Term Analysis of Singly-Ionized Manganese

January 13, 2021
Author(s)
Florence Liggins, J C. Pickering, Gillian Nave, Jacob W. Ward, Wan-U Lydia Tchang-Brillet
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 nm to 5500 nm (1820 cm −1 to 121728 cm −1 ). Spectral

Spectrum of Ni V in the Vacuum Ultraviolet

November 27, 2019
Author(s)
Jacob W. Ward, A J. Raassen, Alexander Kramida, Gillian Nave
This work presents 97 remeasured Fe V wavelengths (1200 Å to 1600 Å) and 123 remeasured Ni V wavelengths (1200 Å to 1400 Å) with uncertainties of approximately 2 mÅ. An additional 67 remeasured Fe V wavelengths and 72 remeasured Ni V wavelengths with

Transition probabilities of Co II, weak lines to the ground and low metastable levels

September 5, 2018
Author(s)
James E. Lawler, T. Feigenson, Chris Sneden, John J. Cowan, Gillian Nave
New branching fraction measurements based primarily on data from a cross dispersed echelle spectrometer are reported for 84 lines of Co II. The branching fractions for 82 lines are converted to absolute atomic transition probabilities using radiative

Commissioning the SALT High Resolution Spectrograph's Iodine Cell

July 6, 2018
Author(s)
Lisa A. Crause, R P. Butler, Gillian Nave, Rudi Kuhn, Blaine Lomberg, Alexei Kniazev, Steven M. Crawford, Eric Depagne
We report on commissioning the iodine absorption cell in the High Resolution Spectrograph (HRS) on the Southern African Large Telescope (SALT). The low-, medium- and high-resolution (LR, MR and HR) modes of this fibre-fed, dual-channel, white-pupil vacuum

J. Chem. Phys. 148, 244302 (2018); https://doi.org/10.1063/1.5029929148, 244302(C) 2018 Author(s).Fourier-transform-spectroscopicphotoabsorption cross sections andoscillator strengths for theS2 B 3..u..X 3..g system

June 25, 2018
Author(s)
G. Stark, H. Herde, J. R. Lyons, A. N. Heays, N. Oliveira, Gillian Nave, B. R. Lewis, S. T. Gibson
Photoabsorption cross sections and oscillator strengths for the strong, predissociating vibrational bands, v  11, in the S2 B 3..u .. X 3..g (v; 0) system are reported. Absorption measurements were undertaken of S2 vapor in a radio-frequency discharge

Vanadium Transitions in the Spectrum of Arcturus

February 1, 2018
Author(s)
Michael P. Wood, Chris Sneden, James E. Lawler, E. A. Den Hartog, John J. Cowan, Gillian Nave
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 vanadium lines that are

The Cu II Spectrum

February 24, 2017
Author(s)
Alexander Kramida, Gillian Nave, Joseph Reader
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). In the VUV region

Comprehensive atomic wavelengths, energy levels and hyperfine structure for singly-ionized iron-group elements

January 23, 2017
Author(s)
Gillian Nave, Craig J. Sansonetti, Keeley I. Townley-Smith, J C. Pickering, Florence Liggins, Anne P. Thorne, Christian Clear
We summarize recent work at the National Institute of Standards and Technology and Imperial College London on wavelengths, hyperfi ne structure, energy levels, and analysis of singly-ionized iron-group elements of astrophysical interest.

Extended Analysis of the Spectrum of Singly Ionized Chromium (Cr II)

July 23, 2014
Author(s)
Craig J. Sansonetti, Gillian Nave
We have made new observations of the spectrum of singly-ionized chromium (Cr II) in the region 2850 Angstrom to 37900 Angstrom with the National Institute of Standards and Technology 2 m Fourier transform spectrometer. These data extend our previously

Fe I Oscillator Strengths for the Gaia-ESO Survey

May 27, 2014
Author(s)
Matthew Ruffoni, E. A. Den Hartog, James E. Lawler, N. R. Brewer, K. Lind, Gillian Nave, J C. Pickering
The Gaia-ESO Public Spectroscopic Survey (GES) is conducting a large-scale study of multielement chemical abundances of some 100; 000 stars in the Milky Way with the ultimate aim of quantifying the formation history and evolution of young, mature and

Development of Fiber Fabrey-Perot Interferometers as stable near-infrared calibration sources for high resolution spectrographs

April 30, 2014
Author(s)
Samuel Halverson, Suvrath Mahadevan, Lawrence W. Ramsey, Fred Hearty, John C. Wilson , Jon Holtzman, Stephen L. Redman, Gillian Nave, David Nidever, Matthew Nelson, Nick Venditti, Dmitry Bizyaev , Scott Fleming
We discuss the ongoing development of single-mode ber Fabry-Perot(FFP)Interferometers as precise astrophotonic calibration sources for high precision radial velocity (RV) spectrographs. The devices are simple, inexpensive, monolithic units that can yield a