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

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.

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.

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.

scholarly journals Transition Parameters for Doubly Ionized Lanthanum

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Betül Karaçoban ◽  
Leyla Özdemir
Keyword(s):  
Least Squares ◽  
Configuration Interaction ◽  
Electric Dipole ◽  
Transition Probabilities ◽  
Energy Levels ◽  
Relativistic Effects ◽  
Oscillator Strengths ◽  
Least Squares Fitting ◽  
Hartree Fock

The transition parameters such as the wavelengths, weighted oscillator strengths, and transition probabilities (or rates) for the nd (n=5−9)−nf (n=4−8), nd (n=5−9)−np (n=6−9), np (n=6−9)−ns (n=6−10), and ng (n=5−8)−nf (n=4−8) electric dipole (E1) transitions of doubly ionized lanthanum (La III, Z=57) have been calculated using the relativistic Hartree-Fock (HFR) method. In this method, configuration interaction and relativistic effects have been included in the computations combined with a least squares fitting of the Hamiltonian eigenvalues to the observed energy levels. We have compared the results obtained from this work with the previously available calculations and experiments in literature. We have also reported new transitions with the weighted transition probabilities greater than or equal to 105.

Spectroscopic analysis of M- and N-intrashell transitions in Co-like to Na-like Yb ions

2021 ◽  
Author(s):  
Roshani Silwal ◽  
Dipti Dipti ◽  
Endre Takacs ◽  
Joan M. Dreiling ◽  
Samuel C Sanders ◽  
...  
Keyword(s):  
Electron Beam ◽  
Magnetic Dipole ◽  
Large Scale ◽  
Ion Trap ◽  
Extreme Ultraviolet ◽  
Wavelength Region ◽  
Grazing Incidence ◽  
Spectral Lines ◽  
Electron Beam Ion Trap ◽  
Large Scale Simulations

Abstract The M-intrashell spectra from Co-like Yb43+ through Na-like Yb59+ ions produced in an electron beam ion trap (EBIT) at the National Institute of Standards and Technology have been studied in the extreme ultraviolet (EUV) range. A few N-intrashell transitions for Co-like Yb43+ and Fe-like Yb44+ are also reported. The EUV radiation was observed with a flat-field grazing incidence spectrometer in the wavelength region of about 7.5 nm to 26.2 nm. The electron beam energies were varied between 3.6 keV and 18 keV to produce the ionization stages of interest. The line identifications were based on the large-scale simulations of the EBIT plasma emission using the non-Maxwellian collisional-radiative code NOMAD. A total of 76 previously unobserved spectral lines corresponding to electric-dipole and magnetic-dipole transitions in the above mentioned ions were identified and discussed. In particular, our accurate wavelength of 24.3855±0.0005 nm for a magnetic-dipole (M1) transition in the ground configuration of Co-like ion presents a solid benchmark for comparisons with the most advanced theories of atomic structure.

scholarly journals Recent High Spectral and Spatial Resolution Spectroscopy of Laser-Produced Plasmas and Electron-Ion Beam Plasmas

1977 ◽  
Vol 43 ◽  
pp. 18-18
Author(s):  
G.A. Doschek ◽  
U. Feldman ◽  
D.J. Johnson ◽  
D.J. Nagel
Keyword(s):  
Spatial Resolution ◽  
Spectral Resolution ◽  
Ion Beam ◽  
Normal Incidence ◽  
Grazing Incidence ◽  
Spectral Lines ◽  
Atomic Transition ◽  
Transition Time ◽  
High Spectral Resolution ◽  
Expansion Velocity

Spectra of plasmas produced by a CO2 laser have recently been obtained using a normal incidence slitless spectrograph and a high spectral resolution (0.028 mÅ) grazing incidence spectrograph. The slitless spectrograph forms images of the plasmas in spectral lines and is similar to the instrument flown by NRL on Skylab. The total wavelength coverage is from about 100 Å to about 600 Å. The shapes of the images depend markedly on the type of atomic transition. Time-averaged electron densities in the expanding plumes are calculated, and the expansion velocity is estimated from the profiles of lines recorded by the grazing incidence spectrograph. In addition, spectra of electron-ion beam plasmas between ∼200 Å and 2000 Å were obtained using a stigmatic normal incidence slit spectrograph. The distribution of plasma emisston between the anode and cathode, and the mass motions in the plasmas are discussed.

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.

Revised analysis of the Zn VI spectrum

1994 ◽  
Vol 72 (5-6) ◽  
pp. 193-205 ◽  
Author(s):  
G. J. van het Hof ◽  
Y. N. Joshi ◽  
A. J. J. Raassen
Keyword(s):  
Least Squares ◽  
Wavelength Region ◽  
Grazing Incidence ◽  
Operator Technique ◽  
Least Squares Fitting ◽  
Extensive Data ◽  
Orthogonal Operator ◽  
Transition Array

The spectrum of zinc was photographed in the 100–300 Å (1 Å = 10−10 m) wavelength region on a 10.7 m grazing-incidence spectrograph. On the basis of these precise and extensive data the 3d7–3d64p transition array of Zn VI was reanalysed. All 19 levels of the ground configuration 3d7 were confirmed but the level values were revised. Out of the 161 levels of the 3d64p configuration reported earlier, 10 levels were rejected and 16 new levels were established thus totalling the known levels to 167. The number of the classified lines is 538, almost doubling the previous number. The least-squares-fitting parametric calculations adequately interpret the observed spectrum. The 3d7 configuration was also described by an orthogonal operator technique.

The analysis of the 5s25p2, 5s5p3, 5s25p5d, and 5s25p6s configurations of Te III

1992 ◽  
Vol 70 (9) ◽  
pp. 740-744 ◽  
Author(s):  
Y. N. Joshi ◽  
A. Tauheed ◽  
I. G. Davison
Keyword(s):  
Configuration Interaction ◽  
Ground State ◽  
Wavelength Region ◽  
Normal Incidence ◽  
Configuration Interaction Calculations ◽  
Transition Array

The spectrum of tellurium was photographed in the wavelength region 400–2000 Å (1 Å = 10−10 m) on a 3 m normal incidence spectrograph. The new measurements and configuration interaction calculations lead to major revisions in the earlier analysis of Te III. For the ground state 5s25p2, all but one of the previously known levels have been confirmed. Out of the 26 levels belonging to the three excited configurations, viz. 5s5p3, 5s25p5d, and 5s25p6s, 14 levels have been confirmed, 4 have been rejected, and for 8 of the levels, either the designation, J value or configuration assignments have been revised. Configuration interaction calculations were carried out to interpret the observed spectrum. Seventy-two lines have been classified in the 5s25p2 − (5s5p3 + 5s25p5d + 5s25p6s) transition array.

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.

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