Plasma Physics Reports

, Volume 43, Issue 10, pp 1016–1030 | Cite as

Analysis of applicability of triplet-state emission of molecular hydrogen for spectral diagnostics of a DC discharge

Low-Temperature Plasma

Abstract

The applicability of emission of the N 3Λσ triplet states of molecular hydrogen for spectral diagnostics of the positive column of a dc glow discharge in hydrogen at translational gas temperatures of 360–600 K, specific absorbed powers of 0.8–4.25 W/cm, gas pressures of p = 0.3–15.0 Torr, reduced fields of E/N = 30–130 Td, and electron densities of n e = 4.0 × 109–6.5 × 1010 cm–3 is analyzed by using an advanced level-based semi-empirical collisional−radiative model. It is found that secondary processes make the main contribution to the population and decay of the N 3Λσ = a 3Σ+ g , c 3Π u , g 3Σ+ g , h 3Σ+ g , and i 3Π g triplet states. The dipole-allowed transitions e 3Σ+ g a 3Σ+ g , f 3Σ+ g a 3Σ+ g , g 3Σ+ g and k 3Π u a 3Σ+ g can be used for spectral diagnostics of a dc discharge within a simplified coronal model.

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© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  1. 1.Topchiev Institute of Petrochemical SynthesisRussian Academy of SciencesMoscowRussia

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