Argon ion linelist and level energies in the hollow-cathode discharge

Whaling, Ward; Anderson, Wilmer; Carle, M.T.; Brault, J. W.; Zarem, Hal A.

doi:10.1016/0022-4073(94)00102-d

Cited by 109 publications

(104 citation statements)

References 10 publications

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“…The wavenumber uncertainties of these lines were described as being less than 0.001 cm −1 for the brightest lines, but no individual uncertainties, nor the calibration uncertainty, were published. In order to estimate the calibration uncertainty, we downloaded the spectrum from the NSO data archive 5 and redetermined the wavenumber correction factor using the argon standards of Whaling et al (2002) with the corrections of Sansonetti (2007). We found the wavenumber correction factor to be (−7.09 ± 0.05) × 10 −7 , which is consistent with the published wavenumber correction factor of −7.06 × 10 −7 .…”

Section: Optimized Energy Levels and Ritz Wavelengthssupporting

confidence: 72%

“…We compared values of the correction factor as determined from three atomic species: neutral argon (Ar i), singly ionized argon (Ar ii), and neutral thorium (Th i). The Ar i standards are lowexcitation lines from Whaling et al (2002) with corrections from Sansonetti (2007), while the Ar ii standards are from Whaling et al (1995). For thorium standards, we used 30 of the 31 lines measured by laser spectroscopy by LS3.…”

Section: Measurements and Uncertaintiesmentioning

confidence: 99%

“…Using calculated Ritz wavelengths, as well as compilations such as the atomic spectra database 3 (Ralchenko et al 2011) and the MIT wavelength tables (Harrison 1969), we have identified over 1700 of these lines, including 1622 thorium lines, 94 argon lines, and a few lines of contaminant elements. Since some argon lines are known to show shifts of as much as 6 × 10 −3 cm −1 (tens of m s −1 ), depending on the lamp pressure (Whaling et al 2002;Lovis et al 2006), these lines should not be used as calibration lines. Likewise, contaminant lines and lines that remain unidentified and may be optical artifacts are not suitable for calibration.…”

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confidence: 99%

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THE SPECTRUM OF THORIUM FROM 250 nm TO 5500 nm: RITZ WAVELENGTHS AND OPTIMIZED ENERGY LEVELS

Redman

Nave

Sansonetti

2014

ApJS

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We have made precise observations of a thorium-argon hollow cathode lamp emission spectrum in the region between 350 nm and 1175 nm using a high-resolution Fourier transform spectrometer. Our measurements are combined with results from seven previously published thorium line lists to re-optimize the energy levels of neutral, singly, and doubly ionized thorium (Th i, Th ii, and Th iii). Using the optimized level values, we calculate accurate Ritz wavelengths for 19,874 thorium lines between 250 nm and 5500 nm (40,000 cm −1 to 1800 cm −1 ). We have also found 102 new thorium energy levels. A systematic analysis of previous measurements in light of our new results allows us to identify and propose corrections for systematic errors in Palmer & Engleman and typographical errors and incorrect classifications in Kerber et al. We also found a large scatter with respect to the thorium line list of Lovis & Pepe. We anticipate that our Ritz wavelengths will lead to improved measurement accuracy for current and future spectrographs that make use of thorium-argon or thorium-neon lamps as calibration standards.

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Section: Optimized Energy Levels and Ritz Wavelengthssupporting

confidence: 72%

Section: Measurements and Uncertaintiesmentioning

confidence: 99%

mentioning

confidence: 99%

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THE SPECTRUM OF THORIUM FROM 250 nm TO 5500 nm: RITZ WAVELENGTHS AND OPTIMIZED ENERGY LEVELS

Redman

Nave

Sansonetti

2014

ApJS

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“…The wavenumbers in Table 2 have an uncertainty of dσ = 0.002 cm −1 (dλ = 0.001 Å) which corresponds to two standard deviations in the Ar II wavenumbers, Whaling et al (1995). The uncertainty in our log(g f ) values is 9% which is approximately 0.04 dex.…”

Section: Wavelengths Bfs and Oscillator Strengthsmentioning

confidence: 87%

“…The Ca i spectra were calibrated using Ar ii 4s-4p transition lines from the carrier gas in the HCL. The wavenumbers of 24 Ar ii calibration lines were taken from Whaling et al (1995) in the wavenumber range 12469.2 to 21149.7 cm −1 (8017.5 to 4726.9 Å). A further discussion of wavenumber calibration and uncertainties can be found in Aldenius et al (2006).…”

Section: Discussionmentioning

confidence: 99%

Experimental Ca I oscillator strengths for the 4p–5s triplet

Aldenius¹,

Lundberg

Blackwell-Whitehead³

2009

A&A

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Context. Transition lines of neutral calcium are observed in the spectra of stellar and substellar objects. In particular, the abundance of α-elements in metal-poor stars can place important constraints on the galactic chemical evolution. Such stellar abundance analyses rely heavily on accurate values for the oscillator strength of the observable transitions. Theoretical oscillator strengths are available for most neutral calcium lines visible in stellar spectra, but there are a limited number of experimental values in the literature.Aims. We present new and improved experimental oscillator strengths for the optical Ca i 4p-5s triplet (6102.7, 6122.2, 6162.2 Å). In addition, we present experimental radiative lifetimes for seven energy levels in the triplet system of Ca i.Methods. The oscillator strengths were determined by combining radiative lifetimes with branching fractions. The radiative lifetimes were measured using laser-induced fluorescence, and the branching fractions were determined using intensity calibrated spectra measured with Fourier transform spectrometry. In addition, the spectra were used to determine accurate (dλ = 0.001 Å, dσ = 0.002 cm −1 ) laboratory wavelengths for the 4p-5s transitions.Results. Oscillator strengths for the Ca i 4p-5s lines were determined with an absolute uncertainty of 9%, an uncertainty of ±0.04 dex in the log(g f ) values. The branching fractions were determined with a higher accuracy, resulting in relative uncertainties of 2-3%.

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Atomic Spectroscopy

Martin

Wiese

2006

Springer Handbooks

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Argon ion linelist and level energies in the hollow-cathode discharge

Cited by 109 publications

References 10 publications

THE SPECTRUM OF THORIUM FROM 250 nm TO 5500 nm: RITZ WAVELENGTHS AND OPTIMIZED ENERGY LEVELS

THE SPECTRUM OF THORIUM FROM 250 nm TO 5500 nm: RITZ WAVELENGTHS AND OPTIMIZED ENERGY LEVELS

Experimental Ca I oscillator strengths for the 4p–5s triplet

Atomic Spectroscopy

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