Population inversion of transitions in neon-like ions

Vinogradov, Aleksandr V; Sobelman, Igor I.; Yukov, E A

doi:10.1070/qe1977v007n01abeh008807

Cited by 69 publications

(29 citation statements)

References 6 publications

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“…These lines arise from the 3l-3l 0 transitions 2p 5 3s-2p 5 3p and 2p 5 3p-2p 5 3d. These 3l-3l 0 transitions in Ne-like ions, which are also observed in N-, O-, and F-like ions, are important to many soft X-ray laser schemes (e.g., Vinogradov, Sobelman, & Yukov 1977). Our basic model includes the ground configuration 2p 6 and the excited configurations 2s 2 2p 5 3l and 2sp 6 3l (l ¼ s, p, d ).…”

Section: O-like Ions (Groundmentioning

confidence: 99%

The Effect of High‐lying Levels on Atomic Models Relevant to Spectroscopic Analyses of Solar Extreme‐Ultraviolet Spectra

Doron

Doschek

Feldman

et al. 2002

ApJ

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In this work we investigate the effect of including high-lying configurations in the collisional-radiative models used to calculate spectral line intensities recorded by the Solar Ultraviolet Measurement of Emitted Radiation (SUMER) spectrometer on board the SOHO satellite. Many of the emission lines observed by SUMER are attributed to transitions within the L and M electronic shells of ions isoelectronic to sequences from Li i to Na i. By using atomic data that are mostly generated by the Hebrew University Lawrence Livermore Atomic Code (HULLAC), we incorporate in the atomic models configurations from higher shells and systematically study their effect on the calculated line intensities in selected ions. The high-lying configurations alter the line intensities through radiative cascades and configuration interaction effects. We find that cascades can significantly enhance the line intensities of the considered ions by up to 60% at temperatures of the ion maximum fractional abundance. The enhancement due to cascades increases with increasing temperature and charge state. The configuration mixing effects can either enhance or reduce the line intensities. Generally, the mixing effect becomes less important for higher charge states.

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Section: O-like Ions (Groundmentioning

confidence: 99%

The Effect of High‐lying Levels on Atomic Models Relevant to Spectroscopic Analyses of Solar Extreme‐Ultraviolet Spectra

Doron

Doschek

Feldman

et al. 2002

ApJ

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“…6, shows that the gain values are slightly increased relatively to the optically thin values. It is due to an increase in the optical thickness of resonance lines from 3d levels which has improved the gain values [34].…”

Section: Resultsmentioning

confidence: 99%

Studies on Vuv Lasing with Neon-Like Aluminum Ions

Rahmani

1998

Acta Phys. Pol. A

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The collisional-radiative equilibrium model has been developed in order to investigate the population inversion on aluminum plasma. The population inversion has been established between lower 3s ( 3Ρ01,1P01) and upper 3p (3 Ρ0 , 1 S0) levels. The vacuum ultra-violet lasing on neon-like aluminum ions provides wavelengths of 111.9 nm, 143.2 nm, 157.3 nm. The rate of relative density population, between lower 3S 1Ρ01 and upper 3p 3Ρ0 levels, reaches its highest value of 7.16 at the electron density of 10 19 cm -3 . The modified expression of optical escape factor, in the case of Doppler profile, was introduced in the calculation of opacity effect on the gain magnitudes. The resonance radiation trapping by 3d configuration alters drastically the gain values. A gain greater than 1 cm -1 was found between lasing levels 3s 3 P01 and 3p 3 Ρ0. The enhancement of gam was due to the pumping of the upper level by &electronic recombination process from the ground state of fluorine-like and by the inner-shell ionization process from excited levels of sodium-like ions.

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“…As shown in figures (1-6), the relative sublevel populations grow with the electron density and the temperature due to the increase of collisional excitation rates. For a given temperature, in the region of low electron density, the populations of the configuration array 3d 9 4p are smaller than those of the 3d 9 4d levels, this behavior is due to their strong radiative decay; however, in the region of high electron density, the populations become distributed according to Boltzmann distribution because the collisional de-excitation rates exceed the radiative transition rates [35]. The configuration array 3d 9 4d upper laser levels are more populated than the 3d 9 4p lower laser levels in electron collisional excitation.…”

Section: Level Populationmentioning

confidence: 99%

Population Inversion and X-Ray Laser Gain by Electron Impact Excitation of Ni-Like Tin

Ahmad¹

2015

AJOP

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Excitation energies and transition probabilities for the 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 , and the 1s 2 2s 2 2p 6 3s 2 3p 6 3d 9 4l (l= s, p, d, and f) configurations in nickel-like tin have been used to calculate the reduced population of 99 fine structure levels over a wide range of electron densities and at different electron plasma temperatures. The gain coefficients for those transitions with positive population inversion factors have been calculated as a function of electron density. This study is concerned with the transitions which produce positive gain at XUV and X-ray spectral regions.

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Population inversion of transitions in neon-like ions

Cited by 69 publications

References 6 publications

The Effect of High‐lying Levels on Atomic Models Relevant to Spectroscopic Analyses of Solar Extreme‐Ultraviolet Spectra

The Effect of High‐lying Levels on Atomic Models Relevant to Spectroscopic Analyses of Solar Extreme‐Ultraviolet Spectra

Studies on Vuv Lasing with Neon-Like Aluminum Ions

Population Inversion and X-Ray Laser Gain by Electron Impact Excitation of Ni-Like Tin

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