PLASMA DIAGNOSTICS USING LINE SHAPES IN TOTAL EMISSION SPECTRA

2000 ◽  
Vol 4 (4) ◽  
pp. 8
Author(s):  
E. Ershov-Pavlov ◽  
K. L. Stepanov
Keyword(s):  
Plasma Diagnostics ◽  
Emission Spectra ◽  
Total Emission ◽  
Line Shapes

scholarly journals Assisted Interpretation of Laser-Induced Fluorescence Spectra of Egg-Based Binding Media Using Total Emission Fluorescence Spectroscopy

2006 ◽  
Vol 2006 ◽  
pp. 1-5 ◽  
Author(s):  
Austin Nevin ◽  
Demetrios Anglos
Keyword(s):  
Amino Acids ◽  
Fluorescence Spectroscopy ◽  
Fluorescence Spectra ◽  
Emission Spectra ◽  
Egg Yolk ◽  
Laser Induced Fluorescence ◽  
Oxidation Products ◽  
Total Emission ◽  
Binding Media ◽  
Age Related

Laser-induced fluorescence (LIF) spectroscopy can provide nondestructive, qualitative analysis of protein-based binding media found in artworks. Fluorescence emissions from proteins in egg yolk and egg white are due to autofluorescent aromatic amino acids as well as other native and age-related fluorophores, but the potential of fluorescence spectroscopy for the differentiation between binding media is dependent on the choice of a suitable excitation wavelength and limited by problems in interpretation. However, a better understanding of emission spectra associated with LIF can be achieved following comparisons with total emission fluorescence spectra where a series of consecutive emission spectra are recorded over a specific range. Results using nanosecond UV laser sources for LIF of egg-based binding media are presented which are rationalised following comparisons with total emission spectra. Specifically, fluorescence is assigned to tryptophan and oxidation products of amino acids; in the case of egg yolk, fatty-acid polymerisation and age-related degradation products account for the formation of fluorophores.

scholarly journals Opacity Corrections for Resonance Silver Lines in Nano-Material Laser-Induced Plasma

Atoms ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 73
Author(s):  
Ashraf M. EL Sherbini ◽  
Ahmed H. EL Farash ◽  
Tharwat M. EL Sherbini ◽  
Christian G. Parigger
Keyword(s):  
Emission Spectra ◽  
Target Surface ◽  
Plasma Electron ◽  
Silver Particles ◽  
Experimental Conditions ◽  
Balmer Series ◽  
Line Shapes ◽  
Bulk Silver ◽  
Nano Material ◽  
Silver Target

Q-switched laser radiation at wavelengths of 355, 532, and 1064 nm from a Nd: YAG laser was used to generate plasma in laboratory air at the target surface made of nano-silver particles of size 95 ± 10 nm. The emitted resonance spectra from the neutral silver at wavelengths of 327.9 nm and 338.2 nm indicate existence of self-reversal in addition to plasma self-absorption. Both lines were identified in emission spectra at different laser irradiation wavelengths with characteristic dips at the un-shifted central wavelengths. These dips are usually associated with self-reversal. Under similar conditions, plasmas at the corresponding bulk silver target were generated. The recorded emission spectra were compared to those obtained from the nano-material target. The comparisons confirm existence of self-reversal of resonance lines that emerge from plasmas produced at nano-material targets. This work suggests a method for recovery of the spectral line shapes and discusses practical examples. In addition, subsidiary calibration efforts that utilize the Balmer series Hα-line reveal that other Ag I lines at 827.35 nm and 768.7 nm are optically thin under variety of experimental conditions and are well-suited as reference lines for measurement of the laser plasma electron density.

scholarly journals Kα radiation from low charge chlorine heated by an ion beam for cold dense plasma diagnostics

2011 ◽  
Vol 29 (1) ◽  
pp. 135-140 ◽  
Author(s):  
Tohru Kawamura ◽  
Kazuhiko Horioka ◽  
Fumihiro Koike
Keyword(s):  
Plasma Diagnostics ◽  
Energy Deposition ◽  
Dense Plasma ◽  
Ion Beam ◽  
Spectral Shift ◽  
Transition Energies ◽  
Line Shapes ◽  
Composite Spectra ◽  
Low Charge ◽  
Shell Ionization

AbstractKα radiation from low charge chlorine is examined for cold dense plasma diagnostics. A relativistic atomic structure calculation shows that the transition energies of Kα lines are slightly shifted to a higher-energy side according to the degree of M-shell ionization. Total spectral shift from Cl+ Kα lines up to those with a fully stripped M-shell is about 10 eV. With an assumption that collisional-radiative-equilibrium is valid, spectral calculations were carried out for a C2H3Cl-plasma heated by an ion beam, and clear deformation among spectral line-shapes is found in the range of the electron temperatures of ≤~ 30 eV. Contribution to the composite spectra of Kα lines with an excited electron in the outer-shell is also briefly discussed. Cl-Kα lines with M-shell electrons can be expected to give us distinct understandings for energy deposition by an ion beam in cold dense plasma.

THE LUMINESCENCE OF COMPLEX MOLECULES IN RELATION TO THE INTERNAL CONVERSION OF EXCITATION ENERGY: PART III. THE TOTAL EMISSION SPECTRA OF 1-NAPHTHOIC ACID

1961 ◽  
Vol 39 (9) ◽  
pp. 1776-1782 ◽  
Author(s):  
Robin M. Hochstrasser
Keyword(s):  
Internal Conversion ◽  
Emission Spectra ◽  
Ethanol Solution ◽  
Radiative Energy ◽  
Total Emission ◽  
Equilibrium Studies ◽  
Complex Molecules ◽  
Radiative Energy Transfer ◽  
Energy Part ◽  
Naphthoic Acid

After excitation by 3130-Å light the anion of 1-naphthoic acid in ethanol solution internally converts to the triplet form of the acid. The excited-state equilibrium can be shifted by the addition of a base or an acid. Numerous total emission spectra of 1-naphthoic acid in various solvents can be understood in terms of some well-established principles governing non-radiative energy transfer processes within and between complex molecules.No quantitative equilibrium studies are presented. The results indicate that the lowest excited states of the acid, singlet and triplet, are of π,π* character. The lowest excited singlet state of the anionic form is most probably n,π*, while the lowest triplet level is π,π*.

Photoluminescence spectra of zno microspheres: effects of exciton-polariton and Purcell factor

MRS Advances ◽  
2019 ◽  
Vol 4 (31-32) ◽  
pp. 1759-1767
Author(s):  
Ching-Hang Chien ◽  
Yia-Chung Chang
Keyword(s):  
Theoretical Calculations ◽  
Emission Spectra ◽  
Red Shift ◽  
Light Illumination ◽  
Purcell Factor ◽  
Line Shapes ◽  
Whispering Gallery ◽  
Uv Emission ◽  
Theoretical Predictions ◽  
Guide Lines

ABSTRACTWe present theoretical calculations of the line shapes of emission spectra of ZnO micro spheres (MSs), including the exciton-polariton and Purcell effect. Our calculation explains the red shift of emission peaks of whispering gallery modes (WGMs) in UV range commonly observed in ZnO MSs. We show that the red shift of the UV emission peak is caused by the combination of cavity effect and the polariton dispersion. The positions and relative strengths of sharp peaks arising from WGMs are also simulated by our calculation, and theoretical predictions match well with experimental data. Our calculation provides useful guide lines for the design of MS cavities for applications in white-light illumination, optical communication, and biosensing.

O K-V Spectra of Oxides and Superconducting Materials

1992 ◽  
Vol 36 ◽  
pp. 65-72 ◽  
Author(s):  
Masahiro Sakai ◽  
Shinjiro Hayakawa ◽  
Jun Kawai ◽  
Yohichi Gohshi
Keyword(s):  
Fluorescence Spectra ◽  
Nearest Neighbor ◽  
Emission Spectra ◽  
Cluster Approximation ◽  
X Ray ◽  
Hartree Fock ◽  
Line Shapes ◽  
Orbital Hybridization ◽  
Oxygen Oxygen ◽  
Fluorescence Line

AbstractOxygen K-V (Kα) X-ray fluorescence spectra of MgO, Cu2O, CuO, La2CuO4, La2-xSrxCuO4, YBa2Cu3O7-x , and GdBa2Cu3O7-x are measured. The local (oxygen) and partial (2p) electron density of states (DOS) of these compounds are calculated by the cluster approximation with the discrete variational (DV) Hartree-Fock-Slater (Xα) method. The calculated O 2p DOS are compared with the measured X-ray fluorescence spectra. It is found that the measured 0 K-V X-ray fluorescence line shapes are well reproduced by the O 2p DOS calculated by a cluster including the second nearest neighbor atoms (oxygen atoms) in the solids. This indicates that the oxygen K-V X-ray emission spectra reflect the oxygen-oxygen orbital hybridization in the solid as well as the oxygen-metal orbital hybridization.

scholarly journals Hydrogen Line Shapes in Plasmas with Large Magnetic Fields

Atoms ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 74
Author(s):  
Joël Rosato
Keyword(s):  
Plasma Diagnostics ◽  
Line Shape ◽  
Zeeman Effect ◽  
Line Profiles ◽  
Stark Broadening ◽  
Hydrogen Line ◽  
Line Shapes ◽  
Code Comparison ◽  
Computer Simulation Technique ◽  
Quadratic Zeeman Effect

We report on hydrogen line shape calculations in the presence of an external magnetic field, at conditions such that the quadratic Zeeman effect is important. The latter is described through a term proportional to B2 in the Hamiltonian, accounting for atomic diamagnetism. It provides a shift and an asymmetry on Lorentz triplets, and it leads to the occurrence of forbidden components. Motivated by investigations performed at the fifth edition of the Spectral Line Shape in Plasmas (SLSP5) code comparison workshop, we perform new calculations of hydrogen Lyman line profiles. Field values representative of magnetized white dwarf atmosphere conditions are taken. The calculations are done using a computer simulation technique, designed for Stark broadening modeling. A discussion of the results is done in the framework of plasma diagnostics.

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