Extension of the theory for the intensities of dipole forbidden spectral lines in a plasma

摘要: A consistent theory describing the effect of appearance dipole-forbidden spectral lines (FSL) in a plasma is developed. The accounts only for contributions quasi-static ions to FSL intensity, boundary between these andthe remaining being determined from multiparticle description microfield. contribution electrons has been treated standard manner. present analysis performed more complicated four-level schemes energetic spectrum emitters than previous calculations by authors. This result makes it possible enlarge significantly class and, therefore, plasmas accessible corresponding diagnostic technique. results obtained eliminate many discrepancies theoretical and experimental values ratio intensities (If) ASL—allowed (Ia). effects quadrupole interaction, caused inhomogeneity disturbing microfield on forbidden If allowed Ia lines, have analysed. It shown that, dense high-temperature plasmas, interactions may dominate. Their calculated analytically multi-particle As examples, we If/Ia Ne IX 13.447 Ar XVII 3.904 A. Accounting interaction change IfIa ratios radically (by factor 2–3) range concentrations = 1021-3 x 1024 cm-3 temperatures Ti 0.25-4.5keV. tabulated He I 4471 A, 4922 6678 C IV 1106.4 Cu 4016 which can be efficiently used measuring electron concentration ion temperature 1015-1018 1−100 eV.