4d75s–4d75p Transitions in Ag IV

1983 ◽  
Vol 61 (1) ◽  
pp. 36-39 ◽  
Author(s):  
Th. A. M. vanKleef ◽  
Y. N. Joshi
Keyword(s):  
Least Squares ◽  
Wavelength Region ◽  
Normal Incidence ◽  
Hartree Fock ◽  
Least Squares Fit

The spectrum of silver was photographed in the wavelength region 400–2300 Å on a variety of spectrographs including a 10.7 m normal incidence vacuum spectrograph. The sources used were a sliding spark and a triggered spark. On the basis of these observations, 12 missing levels of the 4d75p configuration and all levels of the 4d75s configuration have been established. The least squares fit and Hartree–Fock calculations support the analysis. Seven hundred and twelve additional lines have been classified in this spectrum, 40 of which are doubly classified and four are trebly classified.

The 5s25p4 – (5s5p5 + 5p36s) transitions in Ce VII and 5s25p3 4S – 5s5p4 4P transitions in Ce VIII

2008 ◽  
Vol 86 (5) ◽  
pp. 714-725
Author(s):  
A Tauheed ◽  
Y N Joshi
Keyword(s):  
Least Squares ◽  
Configuration Interaction ◽  
Wavelength Region ◽  
Normal Incidence ◽  
Grazing Incidence ◽  
Spectral Lines ◽  
Hartree Fock ◽  
Resonance Transitions

The spectrum of cerium was photographed in the 300–1230 Å wavelength region on a 3~m normal incidence spectrograph at the Antigonish laboratory and on a 3 m grazing incidence spectrograph at the Institute of Spectroscopy laboratory in Troitsk in the 250–350 Å region. The 5s25p4 – (5s5p5 + 5p36s) transitions of six-time ionized cerium (Ce~VII) were identified. All levels of these three configurations have been established. Forty spectral lines have been classified in the Ce VII spectrum. Configuration interaction Hartree–Fock calculations and least-squares-fitted parametric calculations were used to interpret the observed spectrum. In the Ce VIII spectrum, we have identified the 5s25p3S3/2 – 5s5p4P1/2, 3/2, 5/2 resonance transitions. PACS Nos.: 32.30.Jc, 32.30.–r

The 4d95p transitions in the tenth spectrum of cesium, Cs X

1991 ◽  
Vol 69 (1) ◽  
pp. 24-25 ◽  
Author(s):  
Y. N. Joshi ◽  
B. Arcimowicz
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Least Squares ◽  
Wavelength Region ◽  
Hartree Fock

The spectrum of cesium was photographed in the 850–400 Å (1 Å = 10−10 m) wavelength region. Nineteen lines were interpreted as transitions between the 4d95s and 4d95p configurations. All levels of the 4d10, 4d95s, and 4d95p configurations were established. Least-squares-fitted parametric calculations and Hartree–Fock ab initio calculations support the analyses.

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.

4d95s–4d95p transitions in Sb VI and Te VII

1979 ◽  
Vol 57 (8) ◽  
pp. 1073-1080 ◽  
Author(s):  
Th. A. M. Van Kleef ◽  
Y. N. Joshi
Keyword(s):  
Least Squares ◽  
Energy Levels ◽  
Normal Incidence ◽  
Atomic Energy ◽  
Hartree Fock ◽  
Intensity Calculations ◽  
Atomic Energy Levels ◽  
Parameter Values

The sixth spectrum of antimony (Sb VI) and the seventh spectrum of tellurium (Te VII) have been photographed in the region 600–2100 Å on a 10.7 m normal incidence spectrograph using a triggered spark source. All levels of the 4d95s and 4d95p configurations of Sb VI and Te VII given in Atomic Energy Levels Volume III have been found to be completely wrong. New level values of the levels of both configurations for these spectra have been established. Thirty-four lines have been classified in the Sb VI spectrum and thirty-three in the Te VII spectrum. The new analyses have been confirmed by parametric level fitting calculations and by intensity calculations of the transitions. A comparison between the least-squares fitted (LSF) parameter values and the Hartree–Fock (HF) parameter values in the Ag II–Te VII sequence is given.

Revised analysis of singly ionized tellurium: Te II

2009 ◽  
Vol 87 (12) ◽  
pp. 1255-1268 ◽  
Author(s):  
A. Tauheed ◽  
Y. N. Joshi ◽  
M. Steinitz
Keyword(s):  
Energy Levels ◽  
Wavelength Region ◽  
Normal Incidence ◽  
Spectral Lines ◽  
Tellurium Atom ◽  
Hartree Fock ◽  
New Energy ◽  
Final Interpretation ◽  
Configuration Interaction Calculations ◽  
State Configuration

Tellurium spectra were recorded on a 3 m normal incidence vacuum spectrograph in the spectroscopy laboratory of St. Francis Xavier University using a triggered spark light source. The spectrum of the singly ionized tellurium atom was investigated in the wavelength region 746–1838 Å using Hartree–Fock configuration interaction calculations involving 5s25p3, 5s5p4, 5s25p2 (5d + 6d + 7d + 8d + 6s + 7s + 8s + 9s) configurations. Earlier analysis by Handrup and Mack has been revised, and 27 new energy levels have been added, to complete the 5s25p3, 5s25p2 (5d + 6d + 6s + 7s) configurations. Now five levels of the ground-state configuration and 78 of the excited configurations are known. Two hundred and nineteen spectral lines have been classified in this spectrum. Least squares fitted parametric calculations were used for the final interpretation and LS percentage compositions. The wavelength accuracy of our measurement for unblended and sharp lines is ±0.005 Å.

Broadband multilayer-coated normal incidence blazed grating with ~10% diffraction efficiency through the 13-16 nm wavelength region

2009 ◽  
Vol 34 (6) ◽  
pp. 818 ◽  
Author(s):  
Lichao Zhang ◽  
Hui Lin ◽  
Chunshui Jin ◽  
Hongjun Zhou ◽  
Tonglin Huo
Keyword(s):  
Diffraction Efficiency ◽  
Wavelength Region ◽  
Normal Incidence ◽  
Blazed Grating

Revised and extended analysis of the 3d10nl configurations in As V, Se VI, and Br VII

1986 ◽  
Vol 64 (3) ◽  
pp. 330-333 ◽  
Author(s):  
Y. N. Joshi ◽  
Th. A. M. Van Kleef
Keyword(s):  
Wavelength Region ◽  
Normal Incidence ◽  
Extended Analysis

The spectra of arsenic, selenium, and bromine were photographed in the wavelength region 450–2000 Å on 6.65- and 3-m normal-incidence spectrographs using a triggered spark source. The new observations have led us to revise and extend the As V, Se VI, and Br VII spectra.

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