Etude des molécules diatomiques. Partie II : Intensités

1977 ◽  
Vol 55 (20) ◽  
pp. 1775-1786
Author(s):  
Jean-Louis Féménias
Keyword(s):  
Emission Spectrum ◽  
Electronic States ◽  
Optical Emission ◽  
Wave Functions ◽  
Effective Hamiltonian ◽  
Intensity Factors ◽  
Optical Emission Spectrum ◽  
Analytical Expressions ◽  
General Method ◽  
Numerical Approaches

Theory of perturbations, giving the diatomic effective Hamiltonian, is used for calculating actual molecular wave functions and intensity factors involved in transitions between states arising from Hund's coupling cases a, b, intermediate a–b, and c tendency. The Herman and Wallis corrections are derived, without any knowledge of the analytical expressions of the wave functions, and generalized to transitions between electronic states with whatever symmetry and multiplicity. A general method for studying perturbed intensities is presented, taking in good part the spectroscopic modern numerical approaches. The method is used in the study of the ScO optical emission spectrum.

Searching for 3D effects in the optical, high spectral resolution emission spectrum of KELT-9b

2021 ◽  
Author(s):  
Lorenzo Pino ◽  
Matteo Brogi ◽  
Jean-Michel Désert ◽  
Emily Rauscher
Keyword(s):  
Emission Spectrum ◽  
Spectral Resolution ◽  
Planet Formation ◽  
Emission Spectra ◽  
Optical Emission ◽  
High Spectral Resolution ◽  
Optical Emission Spectrum ◽  
Hot Jupiters ◽  
Atmospheric Structure ◽  
3D Effects

<p>Ultra-hot Jupiters (UHJs; T<sub>eq</sub> ≥ 2500 K) are the hottest gaseous giants known. They emerged as ideal laboratories to test theories of atmospheric structure and its link to planet formation. Indeed, because of their high temperatures, (1) they likely host atmospheres in chemical equilibrium and (2) clouds do not form in their day-side. Their continuum, which can be measured with space-facilities, can be mostly attributed to H- opacity, an indicator of metallicity. From the ground, the high spectral resolution emission spectra of UHJs contains thousands of lines of refractory (Fe, Ti, TiO, …) and volatile species (OH, CO, …), whose combined atmospheric abundances could track planet formation history in a unique way. In this talk, we take a deeper look to the optical emission spectrum of KELT-9b covering planetary phases 0.25 - 0.75 (i.e. between secondary eclipse and quadrature), and search for the effect of atmospheric dynamics and three-dimensionality of the planet atmosphere on the resolved line profiles, in the context of a consolidated statistical framework. We discuss the suitability of the traditionally adopted 1D models to interprete phase-resolved observations of ultra-hot Jupiters, and the potential of this kind of observations to probe their 3D atmospheric structure and dynamics. Ultimately, understanding which factors affect the line-shape in UHJs will also lead to more accurate and more precise abundance measurements, opening a new window on exoplanet formation and evolution.</p>

Time Evolution of Optical Emission Spectrum of a Hg-HID Lamp Exposed to X-ray

2010 ◽  
Vol 30 (4) ◽  
pp. 449-459 ◽  
Author(s):  
N. A. Harabor ◽  
A. Harabor ◽  
I. Palarie ◽  
I. M. Popescu ◽  
G. Zissis
Keyword(s):  
Emission Spectrum ◽  
Time Evolution ◽  
Optical Emission ◽  
Optical Emission Spectrum ◽  
X Ray

Optical Emission Spectrum Processing Using Wavelet Compression During Wafer Fabrication

2017 ◽  
Vol 30 (4) ◽  
pp. 380-387 ◽  
Author(s):  
Taikang Ning ◽  
Chung Ho Huang ◽  
John Albert Jensen ◽  
Vincent Wong ◽  
Henry Chan
Keyword(s):  
Emission Spectrum ◽  
Optical Emission ◽  
Wafer Fabrication ◽  
Optical Emission Spectrum ◽  
Wavelet Compression

Determination of the reduced electric field in surface dielectric barrier discharge plasmas

2021 ◽  
Vol 103 (3) ◽  
pp. 35-44
Author(s):  
А.А. Mutalip ◽  
◽  
Y.А. Ussenov ◽  
А.K. Akildinova ◽  
М.K. Dosbolayev ◽  
...  
Keyword(s):  
Electric Field ◽  
Emission Spectrum ◽  
Barrier Discharge ◽  
Block Diagram ◽  
Average Energy ◽  
Optical Emission ◽  
Spectral Lines ◽  
Surface Barrier ◽  
Optical Emission Spectrum

In this paper, the experimental determination of the reduced electric field (E/n) in plasma of dielectric coplanar surface barrier discharge (DCSBD) at atmospheric pressure was demonstrated. The plasma characteristics and the experimental setup properties were described, and the optical emission spectrum of the plasma was also measured. The results of optical emission spectroscopy showed the presence of nitrogen molecular bands in the emission spectrum of DCSBD. In particular, the second positive and the first negative systems, as well as low intensity OH and NO lines were identified. The main transport properties of electrons, such as mobility, mean average energy, and diffusion coefficients were calculated using the BOLSIG+ open source software. The dependence of the ratio of intensities of the nitrogen spectral lines on the reduced electric field, the dependence of the E/n on plasma power, and the dependence of the electron energy distribution function (EEDF) on E/n were obtained. An algorithm in the form of a block diagram for determining the reduced electric field by the BOLSIG + program and experimentally measured spectral line intensities are presented. The utilized method is quite simple, accessible and versatile.

The Application of Optical Emission Spectrum in Copper Film Deposition by RF Magnetron Sputtering

2014 ◽  
Vol 1035 ◽  
pp. 469-475 ◽  
Author(s):  
Jia Jun Li ◽  
Yan Chao Shi ◽  
Hao Liu ◽  
Guang Chao Chen
Keyword(s):  
Emission Spectrum ◽  
Copper Film ◽  
Optical Emission ◽  
Rf Magnetron Sputtering ◽  
Scratch Test ◽  
Input Power ◽  
Film Deposition ◽  
Test Method ◽  
Optical Emission Spectrum ◽  
Cu Film

Optical Emission Spectrum (OES) was utilized to monitor the deposition procedure of copper film byradio frequency (RF) magnetron sputtering.The plasma was found to contain Ar, Ar+, Cu and Cu+ when Argon was the working gas. The OES intensity of each composition increased with the increase of the input power of sputtering. Furthermore, intensity of Cu was higher than that ofAr, Ar+ and Cu+. The mechanical property of as-deposited Cu film was measured by scratch test method. It was found that with the increase of the input power, the adhesion strength possessed the maximum value while the square resistance decreased and surface roughness obviously. Theory calculation shows these properties were connected to kinetic energy of atoms in the plasma.

Optical emission spectrum of the NO2+ dication

1987 ◽  
Vol 125 (2) ◽  
pp. 413-427 ◽  
Author(s):  
D. Cossart ◽  
M. Bonneau ◽  
J.M. Robbe
Keyword(s):  
Emission Spectrum ◽  
Optical Emission ◽  
Optical Emission Spectrum
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