A Theoretical Survey of 4s–4p and 4p–4d Transitions in Nickel-Like Ions

1988 ◽  
Vol 102 ◽  
pp. 299-302
Author(s):  
J.-F. Wyart
Keyword(s):  
Ab Initio ◽  
Least Squares ◽  
Generalized Least Squares ◽  
Potential Method ◽  
Current Interest ◽  
Isoelectronic Sequence ◽  
Energy Parameters ◽  
Least Squares Fit ◽  
Charge States ◽  
A Current

AbstractMulticharged ions in the isoelectronic sequence of nickel have a current interest, due to possible population inversions occuring between excited levels. The identification of 4s-4p and 4p-4d transitions was recently extended up to Mo XV, owing to new experiments performed at I.S.A.N., Troitsk (USSR), and to the subsequent interpretation of the first excited configurations by means of the Slater-Condon method and generalized least squares fit of energy parameters along a sequence. For predicting transitions in higher charge states, the same configurations have been studied ab initio by using the relativistic parametric potential method and selected transitions involving short-lived lower levels are given for 14 ions in the sequence from Sr XI to Eu XXXVI.

Generalized least-squares fit of multiequation models

2005 ◽  
Vol 73 (1) ◽  
pp. 69-82 ◽  
Author(s):  
Simon L. Marshall ◽  
James G. Blencoe
Keyword(s):  
Least Squares ◽  
Generalized Least Squares ◽  
Least Squares Fit

Les intensités des raies rotationnelles du système b1Σ+ – X3Σ− de la molécule NF

1986 ◽  
Vol 64 (11) ◽  
pp. 1529-1533 ◽  
Author(s):  
M. Vervloet ◽  
J. K. G. Watson
Keyword(s):  
Fourier Transform ◽  
Ab Initio ◽  
Least Squares ◽  
Relative Size ◽  
Fourier Transform Spectrometer ◽  
Line Intensities ◽  
Transition Moments ◽  
Least Squares Fit

The 0–0 band of the b1Σ+ – X3Σ− system of the NF molecule has been measured in emission using a Fourier-transform spectrometer. The line assignments of Douglas and Jones are confirmed, but their statement regarding the relative size of the parallel and perpendicular transition moments is incorrect. From a least squares fit of the line intensities, we determine the value μ1/μ0 = 0.261 for the ratio of the perpendicular (μ1) and parallel (μ0) transition moments. This value lies between two recent ab initio estimates, 0.96 and 0.049.

Analysis of the (5d8 + 5d76s)–5d76p transitions of seven-times-ionized bismuth: Bi VIII

1995 ◽  
Vol 73 (1-2) ◽  
pp. 63-73
Author(s):  
R. R. Kildiyarova ◽  
Y. N. Joshi ◽  
M. A. Lumsden ◽  
A. J. J. Raassen
Keyword(s):  
Least Squares ◽  
Wavelength Region ◽  
Normal Incidence ◽  
Isoelectronic Sequence ◽  
Scaling Factors ◽  
Energy Parameters ◽  
Transition Array

The spectrum of bismuth was photographed in the 400–1200 Å (1 Å = 10−1 m) wavelength region on a 3 m normal incidence spectrograph using a triggered spark source. The 5d8, 5d76s, and 5d76p configurations of Bi VIII were analysed. The missing 1S0 level of the 5d8 configuration, 27 of 38 levels of the 5d76s configuration, and 30 additional levels of the 5d76p configuration were established. One previously identified level at 338 016 cm−1 (J = 3) was revised to 338 701 cm−1. Two hundred and sixty-three lines were classified in the 5d76s–5d76p transition array, and 26 additional lines were classified in the 5d8–5d76p transition array. The least-squares-fitted parametric calculations interpret the observed spectrum satisfactorily. The scaling factors of the energy parameters were compared in the isoelectronic sequence from Au IV to Bi VIII.

scholarly journals A comparison between generalized least squares regression and top-kriging for homogeneous cross-correlated flood regions

2021 ◽  
Author(s):  
Simone Persiano ◽  
Jose Luis Salinas ◽  
Jery Russell Stedinger ◽  
William H. Farmer ◽  
David Lun ◽  
...  
Keyword(s):  
Least Squares ◽  
Generalized Least Squares ◽  
Least Squares Regression
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