Hydrogenic Transitions in Multiply Charged Fe and Ni Ions

Abstract

Ten lines in the range 3880;:; A ::a 5666 A in the beam-foil spectrum of iron have been identified with specific hydrogenic transitions in Fe rv-vxu. The same transitions were observed from Ni and Ar beams. Deviations from the hydrogenic wavelengths are shown to be consistent with that expected from core polarization. The absence of these lines in astrophysical sources is discussed. A wavelength table is presented for identificat!lon of hydrogenic transitions to be expected in beam-foil spectra.

Beam-foil Spectra of Chlorine and Oxygen Ions at Beam Energies of 6-42 MeV

“…numbers are as high as 15 and even 16. This agrees with the observation by Lennard et al [24], that the only limit for observation of these transitions is the long wavelength limit of the instrument. In this connection it is noteworthy that no An=3 transitions with n > 15 have been seen within the observable wavelength region.…”

Beam-Foil Studies of Radiative Transitions and Lifetimes in Cl IV - Cl X

“…Hallin et al [2] further observed many such lines belonging to ClVI -CIXIV. It is worth adding that in a beam-foil experiment on Fe and Ni, Lennard et al [9] observed previously unreported hydrogen-like transitions in FeIV -FeVIII and NiIV -NiVIII.…”

Relative and absolute level populations in beam-foil—excited neutral helium

“…The data are shown in Table 7, and are plotted in Figs. [43][44][45][46][47][48]. Although polarization apparently varies as a function of energy (59), a polarization change from 5% to 20% would results in only a 2% change in the correction fac tor.…”