Approximate Determination of Radiation Properties in the Arc Plasmas With Admixtures of Copper Vapours

Bogatyreva, N.; Bartlova, Milada; Aubrecht, V.; Kloc, Petr

doi:10.14311/ppt.2019.3.265

Cited by 1 publication

(3 citation statements)

References 4 publications

(4 reference statements)

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“…In addition to the monochromatic spectral modeling, we have also investigated the calculation of band averaged quantities, such as the Planck and Rosseland group means, which are used extensively in radiation-hydrodynamic and radiationtransport models [178][179][180][181][182][183][184][185][186][187][188][189][190][191]. Here we explored the effect of utilizing a first-order model (the present approach), including couplings in the rovibrational structure and line-list (DUO [105]) calculations [137], and analytically averaging over transitions absorption cross sections, which is similar in principle to ignoring couplings in the rovibrational Hamiltonian that would lead to energetically degenerate states.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, we compare results of firstorder and fully-coupled rovibrational line-list calculations and draw conclusions on the effect of couplings to the resulting mean opacities. We note that band-averaged quantities are predominantly utilized in radiation-hydrodynamic simulations and radiation-transport models, where, for example, the Planck mean is used in the optically thin case, and Rosseland mean is used in the optically thick case [178][179][180][181][182][183][184][185][186][187][188][189][190][191].…”

Section: No Case Studymentioning

confidence: 99%

“…Because Rosseland opacities (or cross sections) largely weight the 'valleys' (lower values) of the monochromatic opacity, weak lines as a result of weak couplings can fill these valleys and significantly affect the Rosseland group mean opacity, leading to larger values. This physics is likely to play an important role in radiation-hydrodynamic simulations and radiation-transport models [180,[184][185][186].…”

Section: First-order Vs Coupled Rovibrational Calculations: Irmentioning

confidence: 99%

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A comprehensive study of the radiative properties of NO—a first step toward a complete air opacity

Zammit¹,

Leiding²,

Colgan³

et al. 2022

J. Phys. B: At. Mol. Opt. Phys.

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In this paper we propose a methodology to calculate the radiative properties of the diatomic molecular constituents of air, and utilize the present approach to model the radiative properties of nitrogen monoxide, NO. We also investigate the important physics involved in calculating accurate radiative quantities for air, such as the Planck and Rosseland mean opacities, and emission and absorption coeﬃcients, as well as the couplings accounted for in rovibrational calculations. Complete active space self-consistent ﬁeld multi-reference conﬁguration interaction (CAS-MRCI) calculations were performed in order to model the NO X2Π, a4Π, b4Σ-, 12Σ+, 22Σ+, 32Σ+, G2Σ-, B′2∆, (C, B) 22Π, (H′, L) 32Π, and 12Φ adiabatic states, and calculate the respective molecular data. The γ X2Π -A2Σ+, ε X2Π - D2Σ+, β′ X2Π - B′2∆, “11,000 Å” A2Σ+ - D2Σ+, “infrared” X2Π - X2Π and X2Π-(C, B) 22Π (δ and β) band systems are investigated in monochromatic spectra calculations, as well as the Ogawa a4Π- b4Σ- band and several other band systems. Several conclusions are drawn, such as the importance of including the Ogawa band, which has not been included in previous air radiative models or comprehensive line-list calculations, as well as the importance of performing coupled rovibrational line-list calculations in order to accurately calculate the Rosseland means. We also found that the additional band systems modeled here contribute signiﬁcantly to the total Planck and Rosseland means.

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