A laboratory study of extreme-ultraviolet spectral lines provided empirical data on the 3p23d configuration in high ionization stages of the Ar I sequence. Using a three-electrode spark source with variable inductance, we have identified t elve 3p53d-3p84f transitions in each of the ions V vi to Fe ix. A least-squares procedure gave a fit of Slater integrals, spin-orbit parameters, and interactions of the type aL(L + 1) to the extreme-ultraviolet wavelengths. Using these empirically corrected energy parameters, we recalculated the energy levels of the 3p03d configuration. Within 3p53d, we suggest that six magnetic-dipole transitions may be associated with visible emission lines observed in the solar corona: N3021, Ni xi, 3F3-1D1 X3167, Fe ix, 3F3-0F3; X3534, Fe ix, 3F2-3D2 X3643, Fe ix, 3F3-'D3; 3S01, Ni xi, 3F3-1D2 4359, Fe ix, 3F3-3D2.
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Wagner et al. (1971) studied this question.