Study of relativistic excitation energies and transition data for EUV and SXR spectral lines in Ge XXIX and Kr XXXIII of fusion interest

2019 ◽  
Vol 234 ◽  
pp. 90-97 ◽  
Author(s):  
Zhan-Bin Chen ◽  
Kai Wang
Keyword(s):  
Spectral Lines ◽  
Excitation Energies

scholarly journals Excitation of Spectra of Multiply Ionized Atoms by Capacitor Discharges

1974 ◽  
Vol 28 (3) ◽  
pp. 223-234 ◽  
Author(s):  
Cornelius H. H. Van Deurzen ◽  
John G. Conway
Keyword(s):  
Differential Equation ◽  
Electrical Circuit ◽  
Spectral Lines ◽  
Circuit Parameter ◽  
Excitation Energies ◽  
Time Resolved ◽  
Transfer Rates ◽  
Line Intensities ◽  
Relative Line ◽  
Varied Intensity

Spectra of vanadium have been produced in a vacuum sliding spark, and their relative line intensities have been measured as parameters of the electrical circuit were varied. Intensity maxima of the spectral lines are interpreted as representing excitation energies and have been found to depend in a definitive manner on the power delivered to the source and on the duration of the discharge. The differential equation of the circuit is solved for the charge and energy transfer rates from the capacitor to the source, and two functions of the continuous circuit parameter [Formula: see text] are defined which greatly assist in interpreting the effect of the circuit parameters on the excitation in the source. A relationship was found between the excitation in the source and the electrical circuit parameters. By means of this relationship one may obtain a good estimate of the excitation gained in the spark source. It is shown that by exercising careful control over the circuit parameters it is possible to separate spectra of neighboring ionization stages through either total pulse or time-resolved observations.

A Critical Comparison of Ar and Ar-N2 Inductively Coupled Plasmas as Excitation Sources for Atomic Emission Spectrometry

1981 ◽  
Vol 35 (3) ◽  
pp. 292-302 ◽  
Author(s):  
Akbar Montaser ◽  
V. A. Fassel ◽  
J. Zalewski
Keyword(s):  
Gas Flow ◽  
Neutral Atom ◽  
Detection Limits ◽  
Spectral Lines ◽  
Emission Spectrometry ◽  
Optimum Conditions ◽  
Excitation Energies ◽  
Outer Flow ◽  
Carrier Gas ◽  
Ar Plasma

Ar-N2 plasmas generated by introducing N2 into the outer and the aerosol carrier gas flows were investigated using a 5 kW, 27.12 MHz crystal-controlled rf generator. The dependence of plasma geometry, plasma background intensity, net analyte emission intensity, signal/background ratio, signal/noise ratios, and the detection limits on forward power (1000 to 4000 W), the outer gas flow (15 to 50 liters/min) and aerosol carrier gas flow (1 to 2.5 liters/min), sample uptake rate (1 to 5 ml/min), and gas composition (0 to 100% N2) were studied for observation heights of 5 to 40 mm. Measurements were conducted simultaneously for 20 ion and neutral atom spectral lines. Ultrasonic nebulization, with aerosol desolvation, was employed. Except for the observation height, which was 10 mm, the optimum conditions for Ar-N2 plasmas containing 5 to 15% N2 in the outer gas flow were roughly identical to those of a conventional Ar plasma. When pure N2 was used in the outer flow, two sets of optimum conditions, quite different than the optimum conditions for the conventional Ar plasma, were found for the high and medium excitation energy lines. Detection limits and signal/background ratios of ion and neutral atom lines of the high excitation energies, excited in a pure Ar plasma, were superior to the results obtained in the Ar-N2 plasma when pure N2 was used in the outer flow. The opposite trend was observed for neutral atom lines of medium excitation energies. The use of N2 aerosol carrier gas, when the outer gas flow was pure Ar, deteriorated the detection limits of all elements.

Electron Number Density Measurements in Ar and Ar-N2 Inductively Coupled Plasmas

1982 ◽  
Vol 36 (6) ◽  
pp. 613-617 ◽  
Author(s):  
Akbar Montaser ◽  
Velmer A. Fassel
Keyword(s):  
Spectral Lines ◽  
Signal Recovery ◽  
Gas Flows ◽  
Inductively Coupled Plasmas ◽  
Electron Number ◽  
Excitation Energies ◽  
Experimental Conditions ◽  
Outer Flow ◽  
Inductively Coupled ◽  
Coupled Plasmas

The emission spectrum of the series limit of Al was used to estimate the electron number densities ( n e) in inductively coupled Ar or Ar-N2 plasmas (ICP). The spectra of the series limit were recorded either with a silicon-intensified target vidicon detector or by a computer-controlled, scanning spectrometer. Background stripping was performed on the spectra recorded by both instruments to enhance signal recovery. Under comparable experimental conditions, the n e values in the Ar-supported ICP were higher than those observed in Ar-N2 plasma, when pure N2 was used in the outer flow. However, the n e value of the Ar ICP under the conditions commonly used in analytical laboratories (15 mm observation height and 1200 W forward power) was comparable to that found in pure N2 outer flow, Ar-N2 plasmas operated under conditions (5 mm observation height and 3000 W forward power) suitable for exciting spectral lines of high excitation energies. Whereas the use of higher, carrier gas flows tended to reduce the n e values of the Ar ICP substantially, this trend was not observed for the pure N2 outer flow Ar-N2 plasma.

scholarly journals REDUCING THE DETECTION LIMITS OF SPECTROMETER WITH NITROGEN MICROWAVE PLASMA «GRAND-SVCH»

2020 ◽  
Vol 8 (1) ◽  
pp. 108-117
Author(s):  
Oleg V. Komin ◽  
Oleg V. Pelipasov
Keyword(s):  
Excitation Energy ◽  
Flow Rate ◽  
Gas Flow ◽  
Microwave Plasma ◽  
Detection Limits ◽  
Spectral Lines ◽  
Excitation Source ◽  
Gas Flow Rate ◽  
Excitation Energies ◽  
Varying Parameters

The article presents the results of a study of the effect of the power supplied to the microwave plasma and the nebulizer gas flow rate on the detection limits of the spectrometer with nitrogen microwave plasma «Grand-SVCH». It is shown that a change of the spectral lines intensity of the elements being determined with varying parameters of the spectra excitation source is related to their excitation energy. The maximum intensities of the lines are achieved at a power of 1700 W and a nebulizer gas flow of 0,4 l/min and 0,6 l/min for lines with excitation energies of 4-15 eV and 3,5-4 eV, respectively. Using the obtained values of the parameters of the excitation source of the spectra allows reducing the detection limits of elements by 1,5-4 times.

Spectroscopic study of EUV and SXR spectral lines with partition function and level population of W LVI

2021 ◽  
Author(s):  
Rinku Sharma ◽  
Richa Paijwar
Keyword(s):  
Partition Function ◽  
Excited States ◽  
Extreme Ultraviolet ◽  
Energy Levels ◽  
Calculated Data ◽  
Spectral Lines ◽  
Thermodynamic Quantities ◽  
Excitation Energies ◽  
Relative Population ◽  
Higher Excited States

We present comprehensive and elaborate study of W LVI (K-likeW55+) by using multi-configuration Dirac-Fock method (MCDF). We have included relativistic corrections, QED (Quantum electrodynamics) and Breit corrections in our computation. We have reported energy levels and radiative data for multipole transitions i.e. electric dipole (E1), electric quadrupole (E2), magnetic dipole (M1) and magnetic quadrupole (M2) within lowest 142 fine structure levels and predicted soft x-ray transition (SXR) and extreme ultraviolet transitions (EUV) from higher excited states to ground state. We have compared our calculated data with energy levels compiled by NIST and other available results in literature and small discrepancies found with them are discussed. Since only few lowest levels are only available in the literature, therefore for checking excitation energies of higher excited states, we have performed same calculations with distorted wave method. Furthermore, we have also provided relative population for first five excited states, partition function and thermodynamic quantities for both W LVI and studied their variations with temperature. We believe that our reported new atomic data of W LVI may be useful in identification and analysis of spectral lines from various astrophysical and fusion plasma sources and also beneficial in plasma modeling.

Spectroscopic study of EUV and SXR transitions of Cs XXV

2018 ◽  
Vol 96 (8) ◽  
pp. 871-877
Author(s):  
Arun Goyal ◽  
Indu Khatri ◽  
Narendra Singh ◽  
Sunny Aggarwal ◽  
A.K. Singh ◽  
...  
Keyword(s):  
Theoretical Study ◽  
Extreme Ultraviolet ◽  
Energy Levels ◽  
Spectral Lines ◽  
Atomic Data ◽  
Distorted Wave ◽  
Fusion Plasma ◽  
Excitation Energies ◽  
X Ray ◽  
Plasma Research

We report an extensive and elaborate theoretical study of atomic data for Cs XXV by using multi-configuration Dirac–Fock method and calculated energy levels for the lowest 110 fine structure levels. We have presented the radiative data for electric and magnetic dipole (E1, M1) and quadrupole (E2, M2) transitions among lowest 110 levels. We have made comparisons of our calculated excitation energies with theoretically calculated and experimentally observed energy levels. We have studied the effect of correlation by introducing more configurations in our calculations. We have also computed energy levels by performing similar relativistic distorted wave calculations using Flexible Atomic Code. Additionally, we have also provided new atomic data for Cs XXV and identified extreme ultraviolet and soft X-ray spectral lines with gA spectra for E1 and M2 transitions, which are not published elsewhere in the literature. We believe that our results may be beneficial in fusion plasma research and applications.

scholarly journals The Berkeley Program on Molecules of Astrophysical Interest

1994 ◽  
Vol 146 ◽  
pp. 397-411
Author(s):  
Sumner P. Davis
Keyword(s):  
Fourier Transform ◽  
Spectral Lines ◽  
Carbon Clusters ◽  
Molecular Spectra ◽  
Fourier Transform Spectrometer ◽  
Excitation Energies ◽  
Astrophysical Interest ◽  
Computer Codes ◽  
The Fourier Transform ◽  
Systematic Program

A systematic program of laboratory analyses of selected molecular spectra of astrophysical interest started in 1958 and continues to the present time. The program includes production of spectral atlases, tabulations of spectral lines, analyses, calculations of excitation energies and molecular parameters, measurements of radiative lifetimes, and determinations of transition strengths. Work has been completed or is in progress on the spectra of ArH+, C2, carbon clusters, CN, CS, CaCl, CaH, CaS, FeD, FeH, HgH, HgD, InI, LaO, LaS, OD, OH, SH, Si2, SiC2, TiCl, TiO, TiO+, VO, YS, ZrCl, ZrO, and ZrS. The basic needs for astronomically useful data have not changed, but laboratory and analysis methods have become more sophisticated in order to cope with ever greater demands for consistency, accuracy, and breadth of information. The Fourier transform spectrometer and computer codes for analyses have enhanced our ability to satisfy some of these demands.

The Interpretation of Line Profiles

1977 ◽  
Vol 36 ◽  
pp. 191-215
Author(s):  
G.B. Rybicki
Keyword(s):  
Magnetic Fields ◽  
Atomic Physics ◽  
Velocity Fields ◽  
Spectral Lines ◽  
Inhomogeneous Structure ◽  
The Sun ◽  
Line Profiles ◽  
Physical Phenomena

Observations of the shapes and intensities of spectral lines provide a bounty of information about the outer layers of the sun. In order to utilize this information, however, one is faced with a seemingly monumental task. The sun’s chromosphere and corona are extremely complex, and the underlying physical phenomena are far from being understood. Velocity fields, magnetic fields, Inhomogeneous structure, hydromagnetic phenomena – these are some of the complications that must be faced. Other uncertainties involve the atomic physics upon which all of the deductions depend.

Current Status of Solid-State X-Ray Systems

1985 ◽  
Vol 43 ◽  
pp. 158-161
Author(s):  
Martin Peckerar ◽  
Anastasios Tousimis
Keyword(s):  
Solid State ◽  
Electric Fields ◽  
Spectral Lines ◽  
Current Status ◽  
Mobile Charge ◽  
Electron Hole ◽  
X Ray ◽  
Sensing Systems ◽  
Transmission Electron ◽  
Electron Microscopes

Solid state x-ray sensing systems have been used for many years in conjunction with scanning and transmission electron microscopes. Such systems conveniently provide users with elemental area maps and quantitative chemical analyses of samples. Improvements on these tools are currently sought in the following areas: sensitivity at longer and shorter x-ray wavelengths and minimization of noise-broadening of spectral lines. In this paper, we review basic limitations and recent advances in each of these areas. Throughout the review, we emphasize the systems nature of the problem. That is. limitations exist not only in the sensor elements but also in the preamplifier/amplifier chain and in the interfaces between these components.Solid state x-ray sensors usually function by way of incident photons creating electron-hole pairs in semiconductor material. This radiation-produced mobile charge is swept into external circuitry by electric fields in the semiconductor bulk.

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