Mutualism in the 21st Century

Vriens, E.M.

doi:10.33540/508

Cited by 1 publication

(1 citation statement)

References 108 publications

(272 reference statements)

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“…We concluded that (1) for excitation from p = 2, Johnson's original formula yields reasonably good agreement with the several existing calculations, including that by Pathak et al [5], and we have adopted this formula; and (2) for excitation from levels p > 3, the only data to be used for comparison are those calculated by Pathak et al for transitions between the lower lying levels and the calculations [12,13] and the laser induced fluorescence spectroscopy experiment [14] for the much higher lying levels. We have adopted the semi-empirical formula by Vriens and Smeets [15], which fits these data well.…”

Section: Excitation and Ionization Cross-sectionsmentioning

confidence: 99%

New density diagnostic method based on emission line intensity ratio of neutral hydrogen in an ionizing phase plasma

1988

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For high temperature hydrogen plasmas in the ionizing phase, the population density of the excited levels has been calculated for a wide range of electron densities and temperatures. In the calculation we employed the most recent and reliable cross-section data for excitation between discrete levels and the ionization cross-section data from these levels. The line intensity ratios calculated under conditions of optical thinness are presented graphically for the Lyman and Balmer series lines. The intensity ratios are found to be rather insensitive to the electron temperature for temperatures higher than 10 eV. These values may be used for determining the electron density in the region of 1017 ⪅ ne ⪅ 1021 m−3, which is relevant to fusion research plasmas. Radiation loss from the plasma and energy loss from the plasma electrons are also presented for a wide range of electron densities and temperatures.

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