Nucleon structure as a background for determination of fundamental parameters

1993 ◽  
Vol 48 (1) ◽  
pp. 129-136
Author(s):  
V. A. Bednyakov ◽  
Yu. P. Ivanov ◽  
S. G. Kovalenko
Keyword(s):  
Nucleon Structure ◽  
Fundamental Parameters

Sorption of Se (IV) from aqueous solutions with subsequent determination by X-ray fluorescence analysis

2020 ◽  
Vol 86 (10) ◽  
pp. 5-9
Author(s):  
D. G. Filatova ◽  
A. A. Arkhipenko ◽  
M. A. Statkus ◽  
V. V. Es’kina ◽  
V. B. Baranovskaya ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Fluorescence Analysis ◽  
Standard Samples ◽  
Phase Contact Time ◽  
Sorbent Phase ◽  
X Ray ◽  
Fundamental Parameters ◽  
Inductively Coupled ◽  
Subsequent Determination

An approach to sorptive separation of Se (IV) from solutions on a novel S,N-containing sorbent with subsequent determination of the analyte in the sorbent phase by micro-x-ray fluorescence method is presented. The sorbent copolymethylenesulfide-N-alkyl-methylenamine (CMA) was synthesized using «snake in the cage» procedure and proven to be stable in acid solutions. Conditions for quantitative extraction of Se (IV) were determined: sorption in 5 M HCl or 0.05 M HNO3 solutions when heated to 60°C, phase contact time being 1 h. The residual selenium content in the solution was determined by inductively coupled plasma mass spectrometry (ICP-MS) using 82Se isotope. The absence of selenium losses is proved and the mechanism of sorption interaction under specified conditions is proposed. The method of micro-x-ray fluorescence analysis (micro-RFA) with mapping revealed a uniform distribution of selenium on the sorbent surface. The possibility of determining selenium in the sorbent phase by micro-RFA is shown. When comparing the obtained results with the results of calculations by the method of fundamental parameters, it is shown the necessity of using standard samples of sorbates to obtain correct results of RFA determination of selenium in the sorbent phase.

ANALYSIS OF SOLDERS ON TIN AND LEAD BASES BY X-RAY FLOORESCENT SPECTROSCOPY

2021 ◽  
pp. 124-131
Author(s):  
A.V. Alekseev ◽  
◽  
G.V. Orlov ◽  
P.S. Petrov ◽  
A.V. Slavin ◽  
...  
Keyword(s):  
Emission Spectroscopy ◽  
High Resolution Mass Spectrometry ◽  
Analytical Signal ◽  
Atomic Emission ◽  
Standard Samples ◽  
X Ray ◽  
Fundamental Parameters ◽  
The Matrix ◽  
Resolution Mass

The determination of the elements Cu, Ni, Sb, Bi, Pb, Zn and Fe in the tin-based solder VPr35, as well as the elements Sn, Ni, Sb, Bi and In in the lead-based VPr40 solder by the method of х-ray fluorescence spectroscopy has been carried out. The calibration dependences are corrected taking into account the superposition of signals from interfering elements on the analytical signal and changes in intensity caused by inter-element influences in the matrix. The analysis was carried out by the method of fundamental parameters without using standard samples. The correctness of the results obtained was confirmed by their comparative analysis by atomic emission spectroscopy and high-resolution mass spectrometry with a glow discharge.

NCSXRF: A General Geometry Monte Carlo Simulation Code for EDXRF Analysis

1991 ◽  
Vol 35 (B) ◽  
pp. 727-736 ◽  
Author(s):  
T. He ◽  
R. P. Gardner ◽  
K. Verghese
Keyword(s):  
Least Square ◽  
Influence Coefficient ◽  
Standard Samples ◽  
Simulation Code ◽  
X Ray ◽  
Fundamental Parameters ◽  
Edxrf Analysis ◽  
Influence Coefficient Method ◽  
Energy Pulse

EDXRF analysis is conveniently split into two parts: (1) the determination of X-ray intensities and (2) the determination of elemental amounts from X-ray intensities. For the first, most EDXRF analysis has been done by some method of integrating the essentially Gaussian distribution of observed full energy pulse heights. This might be done, for example, by least-square fitting of Gaussian distributions superimposed on a straight line or a quadratic background. Recently more elaborate shapes of the energy peaks also have been considered (Kennedy, 1990). After the X-ray intensities have been determined, interelement effects between the analyte element and other elements must be corrected for in order to obtain the elemental amounts from X-ray intensities. This correction can be done either by an empirical correction procedure as in the influence coefficient method which requires measurements on a number of standard samples to determine the required coefficients, or by theoretical calculation as in the fundamental parameters method which does not require standard samples.

scholarly journals Laser-Induced Breakdown Spectroscopy for Determination of Spectral Fundamental Parameters

2020 ◽  
Vol 10 (14) ◽  
pp. 4973
Author(s):  
Sabrina Messaoud Aberkane ◽  
Ali Safi ◽  
Asia Botto ◽  
Beatrice Campanella ◽  
Stefano Legnaioli ◽  
...  
Keyword(s):  
Transition Probabilities ◽  
Oscillator Strengths ◽  
Stark Broadening ◽  
Future Perspectives ◽  
Fundamental Parameters ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
And Shifts ◽  
Analytical Approaches

In this review, we report and critically discuss the application of LIBS for the determination of plasma-emission fundamental parameters, such as transition probabilities, oscillator strengths, Stark broadening and shifts, of the emission lines in the spectrum. The knowledge of these parameters is of paramount importance for plasma diagnostics or for quantitative analysis using calibration-free LIBS methods. In the first part, the theoretical basis of the analysis is laid down; in the second part, the main experimental and analytical approaches for the determination by LIBS of the spectral line spectroscopic parameters are presented. In the conclusion, the future perspectives of this kind of analysis are discussed.

scholarly journals First results from MFOSC-P: low-resolution optical spectroscopy of a sample of M dwarfs within 100 parsecs

2020 ◽  
Vol 492 (4) ◽  
pp. 5844-5852 ◽  
Author(s):  
A S Rajpurohit ◽  
Vipin Kumar ◽  
Mudit K Srivastava ◽  
F Allard ◽  
D Homeier ◽  
...  
Keyword(s):  
Effective Temperature ◽  
Spectral Synthesis ◽  
Surface Gravity ◽  
Low Resolution ◽  
M Dwarfs ◽  
Physical Research Laboratory ◽  
Fundamental Parameters ◽  
Faint Object ◽  
First Results

ABSTRACT Mt Abu Faint Object Spectrograph and Camera (MFOSC-P) is an in-house-developed instrument for the Physical Research Laboratory (PRL) 1.2 m telescope at Mt Abu, India, commissioned in 2019 February. Here we present the first science results derived from the low-resolution spectroscopy programme of a sample of M dwarfs carried out during the commissioning run of MFOSC-P between 2019 February and June. M dwarfs carry great significance for exoplanet searches in the habitable zone and are among the promising candidates for the observatory’s several ongoing observational campaigns. Determination of their accurate atmospheric properties and fundamental parameters is essential to constrain both their atmospheric and evolutionary models. In this study, we provide a low-resolution (R ∼ 500) spectroscopic catalogue of 80 bright M dwarfs (J < 10) and classify them using their optical spectra. We have also performed spectral synthesis and χ2 minimization techniques to determine their fundamental parameters regarding effective temperature and surface gravity by comparing the observed spectra with the most recent BT-Settl synthetic spectra. The spectral type of M dwarfs in our sample ranges from M0 to M5. The derived effective temperature and surface gravity range from 4000–3000 K and 4.5–5.5 dex, respectively. In most of the cases, the derived spectral types are in good agreement with previously assigned photometric classifications.

scholarly journals Physical Input for the Determination of Stellar Abundances

1988 ◽  
Vol 132 ◽  
pp. 333-343 ◽  
Author(s):  
B. Gustafsson
Keyword(s):  
High Resolution ◽  
Physical Modelling ◽  
Stellar Abundances ◽  
Fundamental Parameters ◽  
Recent Developments

The fundamental parameters and the physical modelling and data used in the analysis of high-resolution high S/N spectra of stars are discussed. Particular emphasis is led on recent developments in these respects and the importance of further improvements is stressed.

Determination of Fundamental Parameters for Fast Ignition Using Deuteron Beam in DT and D3He Fuels

2015 ◽  
Vol 34 (5) ◽  
pp. 1134-1145
Author(s):  
S. N. Hosseinimotlagh ◽  
A. Gharaati ◽  
J. Bahmani
Keyword(s):  
Deuteron Beam ◽  
Fast Ignition ◽  
Fundamental Parameters

scholarly journals SPIN AND ORBITAL ANGULAR MOMENTUM IN THE PROTON

2009 ◽  
Vol 18 (05n06) ◽  
pp. 1116-1134 ◽  
Author(s):  
ANTHONY W. THOMAS
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Current Data ◽  
Proton Spin ◽  
Current Status ◽  
Nucleon Structure ◽  
Upper Limits ◽  
European Muon Collaboration ◽  
Spin Crisis

Since the announcement of the proton spin crisis by the European Muon Collaboration there has been considerable progress in unravelling the distribution of spin and orbital angular momentum within the proton. We review the current status of the problem, showing that not only have strong upper limits have been placed on the amount of polarized glue in the proton but that the experimental determination of the spin content has become much more precise. It is now clear that the origin of the discrepancy between experiment and the naive expectation of the fraction of spin carried by the quarks and anti-quarks in the proton lies in the non-perturbative structure of the proton. We explain how the features expected in a modern, relativistic and chirally symmetric description of nucleon structure naturally explain the current data. The consequences of this explanation for the presence of orbital angular momentum on quarks and gluons is reviewed and comparison made with recent results from lattice QCD and experimental data.

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