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 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

Spectral line list of potential cosmochronological interest deduced from new calculations of radiative transition rates in singly ionized thorium (Th ii)

2020 ◽  
Vol 496 (4) ◽  
pp. 4507-4516 ◽  
Author(s):  
S Gamrath ◽  
M R Godefroid ◽  
P Palmeri ◽  
P Quinet ◽  
K Wang
Keyword(s):  
Spectral Line ◽  
Radiative Decay ◽  
Energy Levels ◽  
Radioactive Decay ◽  
Wavelength Region ◽  
Radiative Transition ◽  
Spectral Lines ◽  
Oscillator Strengths ◽  
Hartree Fock ◽  
Stellar Ages

ABSTRACT In this work, we report a list of 91 strong Th ii spectral lines in the visible wavelength region that could be used as cosmochronometers in future investigations to determine stellar ages from thorium radioactive decay. This list was established on the basis of a pseudo-relativistic Hartree–Fock model including core-polarization corrections (HFR+CPOL) allowing us to compute the corresponding radiative decay parameters, the latter being found to be in good overall agreement with the most accurate experimental data when available. Besides this semi-empirical approach, the fully relativistic ab initio multiconfiguration Dirac–Hartree–Fock (MCDHF) method was attempted, showing large discrepancies with both the present HFR+CPOL and the most recent experimental oscillator strengths, although the calculated wavelengths from theoretical energy levels agreed with observed spectral line wavelengths within 2.4  per cent.

scholarly journals New Transition and Energy Levels of Three-Times Ionized Krypton (Kr IV)

Atoms ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 48
Author(s):  
M. Raineri ◽  
M. Gallardo ◽  
J. Reyna Almandos ◽  
A. G. Trigueiros ◽  
C. J. B. Pagan
Keyword(s):  
Transition Probabilities ◽  
Energy Levels ◽  
Pulsed Discharge ◽  
Core Polarization ◽  
Polarization Effects ◽  
Hartree Fock ◽  
Theta Pinch ◽  
New Energy ◽  
First Time

A capillary pulsed-discharge and a theta-pinch were used to record Kr spectra in the region of 330–4800 Å. A set of 168 transitions of these spectra were classified for the first time. We extended the analysis to twenty-five new energy levels belonging to 3s23p24d, 3s23p25d even configurations. We calculated weighted transition probabilities (gA) for all of the experimentally observed lines and lifetimes for new energy levels using a relativistic Hartree–Fock method, including core-polarization effects.

scholarly journals Extended analysis of Xe VII and Xe VIII

2017 ◽  
Vol 95 (9) ◽  
pp. 805-810 ◽  
Author(s):  
M. Raineri ◽  
M. Gallardo ◽  
J. Reyna Almandos ◽  
C.J.B. Pagan ◽  
R. Sarmiento
Keyword(s):  
Light Source ◽  
Energy Levels ◽  
Excited Configuration ◽  
Pulsed Discharge ◽  
Hartree Fock ◽  
The Core ◽  
New Energy ◽  
Extended Analysis ◽  
First Time ◽  
Atomic Parameters

A pulsed discharge light source to study the six and seven times ionized xenon spectra in the 419–4642 Å region was used. A set of 40 transitions of Xe VII and 25 transitions of Xe VIII were classified for the first time. We revised the values for the previously known energy levels and extended the analysis for Xe VII to 10 new energy levels belonging to 5s6d, 5s7s and 5s7p, 4d95s25p even and odd configurations, respectively. Seven new energy levels of the core excited configuration 4d95s5d of Xe VIII are presented. For the prediction of the atomic parameters, energy levels, and transition, relativistic Hartree–Fock calculations were used.

On the simultaneous excitation of two electrons in neutral atomic zinc

1978 ◽  
Vol 359 (1698) ◽  
pp. 389-410 ◽  
Keyword(s):  
Energy Levels ◽  
Detailed Examination ◽  
Final State ◽  
Hartree Fock ◽  
Simultaneous Excitation ◽  
Electron Transitions ◽  
Valence Electrons ◽  
Configuration Mixing ◽  
First Time ◽  
State Configuration

In a new investigation of the Zn i absorption spectrum between 400 and 1000 Å, 11 series due to the simultaneous excitation of two electrons have been observed for the first time in Zn i. At least 120 double excitations have been measured. They are identified by comparison with published Zn ii energy levels and with Hartree-Fock calculations. The new lines may be divided broadly into two groups, a longer wavelength group (900-990 Å) due to simultaneous excitation of the two valence electrons, and a shorter wavelength group (420-610 Å) due to simultaneous excitation of one valence and one sub valence subshell electron. A detailed examination of the two groups of two-electron transitions indicates that, in both cases, excitation occurs by a final state configuration mixing process related to conjugate shake-up.

Accurate study on the properties of spectral lines for Na-like Cr13+

2019 ◽  
Vol 97 (4) ◽  
pp. 436-442
Author(s):  
A.K. Singh ◽  
Mayank Dimri ◽  
Dishu Dawra ◽  
Alok K.S. Jha ◽  
Man Mohan
Keyword(s):  
Configuration Interaction ◽  
Energy Levels ◽  
Electric Quadrupole ◽  
General Purpose ◽  
Spectral Lines ◽  
Oscillator Strengths ◽  
Fusion Plasma ◽  
Configuration Interaction Method ◽  
Magnetic Quadrupole ◽  
Configuration Interaction Calculations

An extended calculation of energy levels, radiative rates, and lifetimes are reported for sodium-like chromium. Extensive configuration interaction calculations have been performed using general-purpose relativistic atomic structure package (GRASP). The radiative rates, oscillator strengths, and line strengths are listed for all electric dipole (E1) transitions. However, for magnetic dipole (M1), electric quadrupole (E2), and magnetic quadrupole (M2) transitions, only radiative rates are listed. The importance of valence–valence (VV) and core–valence (CV) correlation effects in the calculation of energy levels have also been shown. To confirm the accuracy of the present results for energy levels by GRASP, independent calculations have been performed by using Flexible Atomic Code (FAC) and configuration interaction method (CIV3). The accuracy of the present levels, wavelengths, transition rates, and lifetimes are assessed by comparing them to available experimental and other theoretical results. We believe that our extensive results may be beneficial in fusion plasma research and astrophysical investigations and applications.

scholarly journals Extended Analysis of Ar III and Ar IV

Atoms ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 47 ◽  
Author(s):  
Mónica Raineri ◽  
Roberto Mejia Castellanos ◽  
Mario Gallardo ◽  
Jorge Reyna Almandos
Keyword(s):  
Light Source ◽  
Transition Probabilities ◽  
Energy Levels ◽  
Pulsed Discharge ◽  
Hartree Fock ◽  
New Energy ◽  
Extended Analysis ◽  
First Time

A pulsed discharge light source was used to study the two and three times ionized argon (Ar II, Ar III) spectra in the 480–6218 Å region. A set of 129 transitions of Ar III and 112 transitions of Ar IV were classified for the first time. We extended the analysis of Ar III to five new energy levels belonging to 3s23p34d, 3s23p35s odd configurations. For Ar IV, 10 new energy levels of the 3s23p23d and 3s23p24p even and odd configurations, respectively, are presented. For the prediction of energy levels, line transitions, and transition probabilities, relativistic Hartree–Fock calculations were used.

scholarly journals Semiclassical perturbation Stark shifts of singly charged argon spectral lines

2019 ◽  
Vol 488 (2) ◽  
pp. 2473-2479
Author(s):  
Rafik Hamdi ◽  
Nabil Ben Nessib ◽  
Sylvie Sahal-Bréchot ◽  
Milan S Dimitrijević
Keyword(s):  
Energy Levels ◽  
Relativistic Correction ◽  
Spectral Lines ◽  
Oscillator Strengths ◽  
Perturbation Approach ◽  
Hartree Fock ◽  
Calculated Energy ◽  
Impact Approximation ◽  
Singly Charged ◽  
Experimental Values

AbstractUsing semiclassical perturbation approach in impact approximation, Stark shifts for singly charged argon (Ar ii) spectral lines have been calculated. Energy levels and oscillator strengths needed for this calculation were determined using Hartree–Fock method with relativistic correction (HFR). We compare our results with experimental values for 100 spectral lines. We also present results as a function of temperature for 161 spectral lines for collisions with electrons, protons, singly charged helium and singly charged argon. This work extends our previous one.

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