Calculation of atomic energy level values

Radziemski, Leon J.; Fisher, Kay; Steinhaus, David W.; Goldman, A.

doi:10.1016/0010-4655(72)90048-3

Cited by 47 publications

(29 citation statements)

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“…The energy levels derived from the lines of Tables I and II are presented in Tables III and IV. The level values were calculated by means of the computer code ELCALC [23]. A comparison between the level values of AEL and those of Tables III and IV shows that the new values are higher by 4^6 cm À1 , which is mainly caused by the new measurement of the lines at 1106, 1112 and 1196…”

Section: The Energy Levelsmentioning

confidence: 99%

Revised and Extended Analysis of the Ag II Spectrum and Term System

et al. 2002

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The Ag II spectrum emitted from hollow cathode discharges has been recorded in the region 940^8500 Ð with Fourier transform and high dispersion photographic instruments. 311 lines have been classi¢ed and measured at high accuracy (AE0.03^0.003 cm À1 above 2000 Ð, AE0.002^0.0005 Ð in the VUV region). Improved energy level values have been derived from the lines, and 24 new odd levels have been found. The level structure has been interpreted by ab initio and parametric calculations.

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Section: The Energy Levelsmentioning

confidence: 99%

Revised and Extended Analysis of the Ag II Spectrum and Term System

et al. 2002

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“…It has of course zero covariances between our measurements and the spectroscopic data on neutral phosphorus. The leastsquares optimization of the energy levels, in an algebraic form that has been well known for 40 years [Kra11,RFSG72], provides the best-fitting X vector as the one that minimizes the quadratic form t IX − M exp N IX − M exp , where N = Σ −1 . The nullity condition of its gradient straightforwardly provides the coordinates of the minimum, explicitly X = ( t INI) −1 t INM exp .…”

Section: (X Y Z S T )mentioning

confidence: 99%

Photodetachment microscopy to an excited spectral term and the electron affinity of phosphorus

Peláez¹,

Blondel

Vandevraye

et al. 2011

J. Phys. B: At. Mol. Opt. Phys.

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A beam of P− ions produced by a cesium sputtering ion source was photodetached in the presence of an electric field, with a single-mode ring dye laser. Neutral P can be produced at one or the other of the fine-structure sub-levels of its 3s 2 3p 3 2 D o excited term. This is the first atomic photodetachment microscopy experiment with excitation of the parent neutral atom out of the fundamental spectral term. The background electron signal due to ground-state photodetachment notwithstanding, photodetachment microscopy images produced at the excited thresholds could be analysed to provide a measure of these excited-term thresholds with interferometric precision. Starting from the three possible fine-structure sub-levels of P − 3s 2 3p 4 3 P, the five fine-structure thresholds that may be detected, taking the selection rules into account, have been measured. They are combined with the spectroscopic data available in the literature on neutral P to produce an improved experimental value of the electron affinity

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“…The weight of the wavenumber of an observed transition was based on the inverse variance and the ground state was considered fixed at zero energy with zero uncertainty. The procedure is described in detail in Öberg (2007) and is based on the method proposed by Radziemski et al (1972). Ritz wavenumbers could then be derived from the fitted energy levels and the difference between these and the observed wavenumbers could be studied, see Fig.…”

Section: Fitting Of Energy Levelsmentioning

confidence: 99%

Accurate Ritz wavelengths of parity-forbidden [$\ion{Fe}{ii}$], [$\ion{Ti}{ii}$], and [$\ion{Cr}{ii}$] infrared lines of astrophysical interest

Aldenius

Johansson

2007

A&A

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Context. With new astronomical infrared spectrographs the demands of accurate atomic data in the infrared have increased. In this region there is a large amount of parity-forbidden lines, which are of importance in diagnostics of low-density astrophysical plasmas.Aims. We present improved, experimentally determined, energy levels for the lowest even LS terms of Fe ii, Ti ii and Cr ii, along with accurate Ritz wavelengths for parity-forbidden transitions between and within these terms.Methods. Spectra of Fe ii, Ti ii and Cr ii have been produced in a hollow cathode discharge lamp and acquired using high-resolution Fourier Transform (FT) spectrometry. The energy levels have been determined by using observed allowed ultraviolet transitions connecting the even terms with upper odd terms. Ritz wavelengths of parity-forbidden lines have then been determined.

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Calculation of atomic energy level values

Cited by 47 publications

References 1 publication

Revised and Extended Analysis of the Ag II Spectrum and Term System

Revised and Extended Analysis of the Ag II Spectrum and Term System

Photodetachment microscopy to an excited spectral term and the electron affinity of phosphorus

Accurate Ritz wavelengths of parity-forbidden [$\ion{Fe}{ii}$], [$\ion{Ti}{ii}$], and [$\ion{Cr}{ii}$] infrared lines of astrophysical interest

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