THE RESONANCE ESCAPE FACTOR AND DENSITY SPATIAL DISTRIBUTION OF Li 670.970 nm RESONANCE LINES

2009 ◽  
Vol 23 (09) ◽  
pp. 1189-1197 ◽  
Author(s):  
JIAN HE ◽  
QINGGUO ZHANG ◽  
QINGDONG CHEN
Keyword(s):  
Spatial Distribution ◽  
Oscillator Strength ◽  
Optical Depth ◽  
Ground State ◽  
Resonance Absorption ◽  
Experimental Results ◽  
Line Center ◽  
Number Density ◽  
Escape Factor ◽  
Good Agreement

In this letter, the resonance escape factors and spatial distribution of three resonance absorption lines that making up the Li 670.970 nm line are discussed theoretically, for both Lorentzian and Voigt profiles. The oscillator strength, the number density of the absorbing atoms in the ground state, and the optical depth in the line center are discussed also in the calculation. The results we calculated are in good agreement with the experimental results. This calculation will be significant in the research of plasma Li atom.

Resonance Escape Factor and Abundance of Plasma Li I Resonance Lines at 671nm

2012 ◽  
Vol 529 ◽  
pp. 532-536
Author(s):  
Guo Xin Xiong ◽  
La Mei Liao
Keyword(s):  
Oscillator Strength ◽  
Ground State ◽  
Resonance Absorption ◽  
Line Center ◽  
Number Density ◽  
Lithium Plasma ◽  
Voigt Profile ◽  
Lorentzian Profile ◽  
Escape Factor ◽  
Good Agreement

To study the spectrum of lithium plasma, the resonance escape factors of three resonance absorption lines that making up the LiⅠ671nm line are discussed theoretically, for both Lorentzian profile and Voigt profile. The number density of the absorbing atoms in the ground state, the oscillator strength, and the optical depth at the line center are also discussed in the calculation. The abundance of lithium relative to hydrogen is evaluated.The results we calculated are in good agreement with the experimental results. This calculation will be significant in the research of plasma lithium plasma.

Escape Factor and Transition Probabilities of Plasma Mg II 280nm Line

2012 ◽  
Vol 529 ◽  
pp. 564-568
Author(s):  
Guo Xin Xiong ◽  
Hong Ying Zhao ◽  
Jian He
Keyword(s):  
Oscillator Strength ◽  
Ground State ◽  
Transition Probabilities ◽  
Resonance Absorption ◽  
Line Center ◽  
Number Density ◽  
Gaussian Profile ◽  
Lorentzian Profile ◽  
Escape Factor ◽  
Good Agreement

To study the spectrum of magnesium plasma, the escape factors and transition probabilities of two resonance absorption lines that making up the MgⅡ280nm line are discussed theoretically, for both Gaussian profile and Lorentzian profile. The oscillator strength, the number density of the absorbing atoms in the ground state, and the optical depth in the line center are discussed also. The results we calculated are in good agreement with the exerimental results, and some useful conclusions are drawn. This calculation will be significant in the research of plasma spectrum of magnesium plasma.

THE PHOTON ESCAPE PROBABILITY OF Na 330.3 nm RESONANCE LINE

2010 ◽  
Vol 24 (29) ◽  
pp. 5703-5709 ◽  
Author(s):  
JIAN HE ◽  
QINGGUO ZHANG ◽  
GANG LIU
Keyword(s):  
Oscillator Strength ◽  
Optical Depth ◽  
Ground State ◽  
Resonance Line ◽  
Line Center ◽  
Number Density ◽  
Escape Probability ◽  
Escape Probabilities ◽  
Cylindrical Geometries

In this paper, the photon escape probability of Na 330.3 nm resonance line is calculated, both for slab and cylindrical geometries. The dependence of the photon escape probability on the optical depth in the line center is considered. The oscillator strength, the number density of the absorbing atoms in the ground state, and the optical depth in the line center are discussed in this calculation. The changes of the photon escape probabilities with different concentrations are calculated. This calculation will provide a method to calculate the photon escape probability for different lines.

FREE-FALL DIFFUSION IN A DISCHARGE AFTERGLOW

1966 ◽  
Vol 44 (11) ◽  
pp. 2615-2630 ◽  
Author(s):  
B. C. Gregory
Keyword(s):  
Electron Temperature ◽  
Free Fall ◽  
Mercury Vapor ◽  
Mean Free Path ◽  
Experimental Results ◽  
Cavity Method ◽  
Number Density ◽  
Langmuir Probes ◽  
Average Electron ◽  
Good Agreement

The afterglow decay of the number density and electron temperature of a plasma in which collisions between electrons and molecules are rare is studied both theoretically and experimentally. The theoretical approach, using the first three moment equations solved in a one-dimensional geometry, predicts non-exponential decay profiles in time for both density and temperature. Experimental results are obtained using a cylindrical mercury vapor discharge tube at pressures where the mean free path of the electrons is much larger than the transverse dimensions of the tube. The average electron number density is measured by a surface-wave cavity method and the electron temperature by means of Langmuir probes. The theoretical and experimental results are in good agreement, especially for the density decay.

Photoelectric Effect Investigations with Linearly Polarized 847, 1368, and 1779 keV Photons

1975 ◽  
Vol 53 (18) ◽  
pp. 1721-1726 ◽  
Author(s):  
B. A. Logan ◽  
R. T. Jones ◽  
A. Ljubičić ◽  
W. R. Dixon ◽  
R. S. Storey
Keyword(s):  
Spatial Distribution ◽  
Photoelectric Effect ◽  
Experimental Results ◽  
Theoretical Predictions ◽  
Linearly Polarized ◽  
Good Agreement

The spatial distribution of photoelectrons, ejected from the K shell of atoms with high atomic numbers by linearly polarized 847, 1368, and 1779 keV photons, has been investigated. The experimental results are in good agreement with existing theoretical predictions when the predictions are modified to allow for distortions produced by scattering of the photoelectrons in the photoelectric target.

The electronic structure and magnetic properties of uranyl-like ions II. Plutonyl

1956 ◽  
Vol 238 (1212) ◽  
pp. 31-45 ◽  
Keyword(s):  
Aqueous Solution ◽  
Magnetic Properties ◽  
Absorption Spectrum ◽  
Electronic Structure ◽  
Energy Levels ◽  
Electronic Configuration ◽  
Resonance Absorption ◽  
Experimental Results ◽  
Microwave Resonance ◽  
Good Agreement

The electronic configuration and bonding in (PuO 2 ) 2+ are considered. The calculated energy levels can be correlated satisfactorily with the absorption spectrum of (PuO 2 ) 2+ in aqueous solution by a plausible choice of numerical parameters. The microwave resonance absorption and paramagnetic susceptibility are derived on the basis of the model, and are in good agreement with experimental results.

Oscillator Strength Measurements in the Vacuum-Ultraviolet by the Emission Method

1988 ◽  
Vol 102 ◽  
pp. 353-356
Author(s):  
C. Goldbach ◽  
G. Nollez
Keyword(s):  
Oscillator Strength ◽  
Vacuum Ultraviolet ◽  
Oscillator Strengths ◽  
Emission Method ◽  
Absolute Scale ◽  
Good Agreement

AbstractThe principles and the realization of an experiment devoted to oscillator strength measurements in the vacuum-ultraviolet by the emission method are briefly presented. The results obtained for the strong multiplets of neutral nitrogen and carbon in the 1200-2000 Å range yield an absolute scale of oscillator strengths in good agreement with the most recent calculations.

Inducing Frictional Force to Enhance the Transient Response in Beams

2019 ◽  
Vol 22 (2) ◽  
pp. 88-93
Author(s):  
Hamed Khanger Mina ◽  
Waleed K. Al-Ashtrai
Keyword(s):  
Numerical Analysis ◽  
Transient Response ◽  
Frictional Force ◽  
Damping Ratio ◽  
Experimental Results ◽  
Damping Capacity ◽  
Tightening Force ◽  
Contact Areas ◽  
Good Agreement ◽  
Ansys Workbench

This paper studies the effect of contact areas on the transient response of mechanical structures. Precisely, it investigates replacing the ordinary beam of a structure by two beams of half the thickness, which are joined by bolts. The response of these beams is controlled by adjusting the tightening of the connecting bolts and hence changing the magnitude of the induced frictional force between the two beams which affect the beams damping capacity. A cantilever of two beams joined together by bolts has been investigated numerically and experimentally. The numerical analysis was performed using ANSYS-Workbench version 17.2. A good agreement between the numerical and experimental results has been obtained. In general, results showed that the two beams vibrate independently when the bolts were loosed and the structure stiffness is about 20 N/m and the damping ratio is about 0.008. With increasing the bolts tightening, the stiffness and the damping ratio of the structure were also increased till they reach their maximum values when the tightening force equals to 8330 N, where the structure now has stiffness equals to 88 N/m and the damping ratio is about 0.062. Beyond this force value, increasing the bolts tightening has no effect on stiffness of the structure while the damping ratio is decreased until it returned to 0.008 when the bolts tightening becomes immense and the beams behave as one beam of double thickness.

PHOTOINDUCED NONLINEAR OCTUPOLAR POLARIZATION: TRANSIENT AND PERMANENT REGIMES

1996 ◽  
Vol 05 (04) ◽  
pp. 653-670 ◽  
Author(s):  
CÉLINE FIORINI ◽  
JEAN-MICHEL NUNZI ◽  
FABRICE CHARRA ◽  
IFOR D.W. SAMUEL ◽  
JOSEPH ZYSS
Keyword(s):  
Theoretical Analysis ◽  
Second Harmonic ◽  
Experimental Results ◽  
Polar Field ◽  
Rotational Spectrum ◽  
Dual Frequency ◽  
One Dimensional ◽  
Ethyl Violet ◽  
Disperse Red 1 ◽  
Good Agreement

An original poling method using purely optical means and based on a dual-frequency interference process is presented. We show that the coherent superposition of two beams at fundamental and second-harmonic frequencies results in a polar field with an irreducible rotational spectrum containing both a vector and an octupolar component. This enables the method to be applied even to molecules without a permanent dipole such as octupolar molecules. After a theoretical analysis of the process, we describe different experiments aiming at light-induced noncentrosymmetry performed respectively on one-dimensional Disperse Red 1 and octupolar Ethyl Violet molecules. Macroscopic octupolar patterning of the induced order is demonstrated in both transient and permanent regimes. Experimental results show good agreement with theory.

scholarly journals Comparison of Experimental and Numerical Transient Drop Deformation during Transition through Orifices in High-Pressure Homogenizers

2021 ◽  
Vol 5 (3) ◽  
pp. 32
Author(s):  
Benedikt Mutsch ◽  
Peter Walzel ◽  
Christian J. Kähler
Keyword(s):  
High Pressure ◽  
Visual Analysis ◽  
Imaging Technique ◽  
Extensional Flow ◽  
Droplet Breakup ◽  
Experimental Results ◽  
Drop Deformation ◽  
Droplet Deformation ◽  
Shadow Imaging ◽  
Good Agreement

The droplet deformation in dispersing units of high-pressure homogenizers (HPH) is examined experimentally and numerically. Due to the small size of common homogenizer nozzles, the visual analysis of the transient droplet generation is usually not possible. Therefore, a scaled setup was used. The droplet deformation was determined quantitatively by using a shadow imaging technique. It is shown that the influence of transient stresses on the droplets caused by laminar extensional flow upstream the orifice is highly relevant for the droplet breakup behind the nozzle. Classical approaches based on an equilibrium assumption on the other side are not adequate to explain the observed droplet distributions. Based on the experimental results, a relationship from the literature with numerical simulations adopting different models are used to determine the transient droplet deformation during transition through orifices. It is shown that numerical and experimental results are in fairly good agreement at limited settings. It can be concluded that a scaled apparatus is well suited to estimate the transient droplet formation up to the outlet of the orifice.

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