Quartet Term Systems of C³⁺–F⁶⁺Ions

Abstract

The C IV, N V, O VI and F VII quartet term systems have been investigated using the beam-foil method, Wavelengths of more than 70 lines associated with these systems are reported. They are compared to theoretical predictions and to data on analogous transitions in singly excited four-electron ions.Certain details of the term structure are discussed as are fine structure splittings and the separations of quartet terms arising from electron configuration 1s2p3p, 1s2p3d, and 1s2p4d. In the isoelectronic comparison the effect of configuration mixing becomes apparent for the last case.

High‐lying core‐excited quartet states in Li‐like N4+ and F6+ ions

“…As Table II shows, the transition wavelengths in this work are in good agreement with other theoretical predictions and experimental results. beam-foil method [3]. For the F 6þ ion, the transition wavelength between 1s2p2p 4 P(1) and 1s2p3s 4 P o (3) is 11.879 nm, which is the same as the result of Blank et al [3].…”

“…beam-foil method [3]. For the F 6þ ion, the transition wavelength between 1s2p2p 4 P(1) and 1s2p3s 4 P o (3) is 11.879 nm, which is the same as the result of Blank et al [3]. Figure 1 shows the energy-level and transition wavelength diagram for high-lying core excited quartet states 1s2lnl The relativistic energies given in Table I are the center-of-gravity energies.…”

“…With the same method, the transitions in core-excited quartet states for C 3þ , N 4þ , O 5þ , F 6þ ions were also investigated by Martinson et al [6] and Blanke et al [3,4]. Later, Bouchama et al [2] observed the doubly excited quartet systems of N 4þ ions by charge exchange of highly charged ions with gaseous targets.…”

Wavelengths and transition probabilities in the quartet spectrum of NV

“…We construct a model-potential VM for the K-shell electron which is such that the eigenvalues sot of the 1-electron Schr6dinger equation (-½ V 2 + VM) 4.~ = ~.~ ~.~ (1) reproduce the ionisation energies of the triplet l snI 3L levels of N VI. The potential V~ which we use,…”

“…Beam-foil studies of the quartet term system of the lithium-like ion NV have recently been reported by Blanke et al [1,2] and by Garnir et al [3,4]. In addition, Bouchama et al [5] have employed an interesting new technique, based on charge exchange in a gas cell, to investigate the quartet spectrum of NV.…”