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.

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 New Energy Levels and Transitions of 5s25p2 (6d+7s) Configurations in Xe IV

Atoms ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 108
Author(s):  
Jorge Reyna Almandos ◽  
Mónica Raineri ◽  
Cesar J. B. Pagan ◽  
Mario Gallardo
Keyword(s):  
Light Source ◽  
Energy Levels ◽  
Least Square ◽  
Pulsed Discharge ◽  
Core Polarization ◽  
Polarization Effects ◽  
Hartree Fock ◽  
New Energy ◽  
First Time ◽  
Least Square Procedure

Three-times ionized xenon Xe IV spectrum in the 1070–6400 Å region was analyzed using a pulsed discharge light source. A set of 163 transitions was classified for the first time, and 36 new energy levels belonging to the 5s25p26d and 5s25p27s even configurations were determined. The relativistic Hartree–Fock method, including core-polarization effects, were used. In these calculations, the electrostatic parameters were optimized by a least-square procedure in order to improve the adjustment to experimental energy levels. We also present a calculation based on a relativistic multiconfigurational Dirac–Fock approach.

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.

LOW-SPIN STATES OF 76Se EXCITED IN 76Br(β++EC)76Se DECAY

2004 ◽  
Vol 13 (05) ◽  
pp. 933-947
Author(s):  
YAN LI ◽  
SHUIFA SHEN ◽  
WENDA HUANG ◽  
SHUANGHUI SHI ◽  
JIAHUI GU ◽  
...  
Keyword(s):  
High Resolution ◽  
Energy Levels ◽  
Spin States ◽  
Hpge Detectors ◽  
New Energy ◽  
Coincidence Mode ◽  
Γ Rays ◽  
First Time

The decay of bromine-76 was studied using high resolution HpGe detectors in singles and coincidence mode. Bromine-76 was produced via two reactions: 75 As (α,3 n )76 Br and 76 Se ( p , n )76 Br . The results of these experiments verified the previously reported levels of 76 Se . In addition to the previously described transitions and levels, 37 new γ-rays and 15 new energy levels were found for the first time.

The simultaneous excitation of two electrons in atomic cadmium

1978 ◽  
Vol 362 (1708) ◽  
pp. 129-144 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Energy Levels ◽  
Final State ◽  
Electron Synchrotron ◽  
Continuum Source ◽  
Hartree Fock ◽  
Simultaneous Excitation ◽  
Background Continuum ◽  
Configuration Mixing ◽  
First Time

A new investigation of the Cd I absorption spectrum, with an electron synchrotron as a background continuum source, has revealed 110 new features between 400 and 1100 Å. The new lines are identified by comparison with Cd II energy levels, Hartree-Fock calculations and the Zn I absorption spectrum in the same energy region (Mansfield & Connerade 1978). All are attributable to simultaneous excitation of two electrons, observed for the first time in cadmium. At longer wavelengths the spectrum is due to the excitation of both valence electrons and at shorter wavelengths it is due to excitation of one valence, and one 4d-subshell electron. The detailed analysis suggests that, as in zinc, double-excitation occurs through a final state configuration mixing process similar to conjugate shake-up.

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.

Multiconfiguration Dirac–Hartree–Fock calculations of energy levels, wavelengths, weighted oscillator strengths, transitions probabilities and lifetimes of Cd XLVII

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Dhia Elhak Salhi ◽  
Soumaya Manai ◽  
Sirine Ben Nasr ◽  
Haikel Jelassi
Keyword(s):  
Missing Data ◽  
Quantum Electrodynamics ◽  
Transition Probabilities ◽  
Energy Levels ◽  
Oscillator Strengths ◽  
Accurate Data ◽  
Cadmium Ion ◽  
Hartree Fock ◽  
First Time ◽  
Good Agreement

Abstract Energy levels, wavelengths, weighted oscillator strengths, transition probabilities and lifetimes are calculated for all levels of 1s 2 and 1snl (n = 2–6) configurations of He-like cadmium ion (Cd XLVII). The calculations were carried out using three codes GRASP2018, FAC and AMBiT in order to provide theoretically the most accurate data. Transition probabilities are reported for all the E1, E2, M1 and M2 transitions. Breit interactions and quantum electrodynamics effects are included in the RCI calculations. Comparisons were made with other calculations and a good agreement was found which confirms the reliability of our results. We present some missing data for the He-like cadmium in this paper for the first time.

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.

Electron Emission from Core and Valence States of Some Semiconductors

1969 ◽  
Vol 24 (10) ◽  
pp. 1555-1558 ◽  
Author(s):  
Dietrich W. Langer
Keyword(s):  
Density Of States ◽  
Electron Emission ◽  
Energy Levels ◽  
X Rays ◽  
Energy Distributions ◽  
Hartree Fock ◽  
The Core ◽  
Valence States ◽  
Valence Bands

Abstract Measurements of the energy distributions of emitted electrons from Si, GaP, and ZnS allowed the determination of the relative positions of some core levels of these materials and the optical density of states of the valence band in Si. These energy levels were determined relative to the Fermi level. The electron emission was induced by monochromatic X-rays (AlKα). These results are compared with values obtained from OPW calculations for the valence bands and selfconsistent Hartree-Fock-Slater calculations for the core states.

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