The spectrum of five-times ionized aluminum was investigated in the 85–113 Å and 100–1500 Å wavelength regions. New energy levels were found in the 2s22p33s, 3p, and 3d configurations. Parametric calculations were made for the 2s22p33p configuration. They were also done for the interacting 2s2p5, 2s22p33s, and 2s22p33d configurations in both Na iv and Al vi. The results are compared with similar calculations in Mg v.
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Wavelengths are given in Å units. Those given to three decimal places have an uncertainty of about ±0.005 Å and those given to two decimal places have an uncertainty of about ±0.01 Å.
Intensities are visual estimates given on the same scale as in Kelly and Palumbo’s compilation.6 (af indicates that a close line affected the measurement.)
In the same multiplet a second line at 96.673 Å was previously given2 but does not appear on our spectra.
The wavelength 328.696 Å was measured in the first, second, and third order on the normal-incidence spectrograph.
The classifications of the lines 1317.62, 1331.24, and 1331.79 Å are only tentative, although they clearly belong to Al vi.
Levels are given in cm−1 units. The 2s22p4 and 2s2p5 level values are from Ref. 5 and were used to derive higher singlet and triplet levels. The quintet system is built on a theoretical value for
and has an internal consistency of less than 5 cm−1.
The 2s22p3(2P)3p3D levels are based on the tentatively classified lines at 1317.62, 1331.24, and 1331.79 Å. See Table I, footnote e.
All the higher 3d levels are determined only by their ground transitions (85–95 Å) and their energies are given to about ± 40 cm−1.
The two levels at 1 168 690 and 1 170 650 have very mixed compositions of 3D2 and 1D2.
TABLE III
Parameter values for the 2s22p33p configuration of Al5+ and comparison with HF values.
Fitted values are given in cm−1, with their standard errors in parentheses.
The value of ζ2p for 2p33s was held equal to that of ζ2p for 2p33d.
The ratio R1(2p2p, 2s3d)/R1(2p2p, 2s, 3s) was fixed at the value derived from the HF calculation.
The ratio R2(2p3d, 2p3s)/R1(2p3d, 3s2p) was fixed at the value derived from the HF calculation.
The composition is given as percentages in the LS basis. Components smaller than 3% are omitted. The LS purities are all better than 97% lor the 2s2p5 and 2s22p33s levels calculated in the same diagonalization.
The 2p3(2D)3d3S1 experimental level was not included in the parametricfit.
TABLE VII
Parameter values for the 2s2p5, 2s22p33s, and 2s22p33d configurations of Na3+ and comparison with HF values.
Fitted values are given in cm−1, with their standard errors in parentheses.
The value of ζ2p for 2p33s was held equal to that of ζ2p for 2p33d.
The ratio R1(2p2p, 2s3d)/R1(2p2p, 2s3s) was fixed at the value derived from the HF calculation.
The ratio R2(2p3d, 2p3s)/R1(2p3M, 3s2p) was fixed at the value derived from the HF calculation.
Wavelengths are given in Å units. Those given to three decimal places have an uncertainty of about ±0.005 Å and those given to two decimal places have an uncertainty of about ±0.01 Å.
Intensities are visual estimates given on the same scale as in Kelly and Palumbo’s compilation.6 (af indicates that a close line affected the measurement.)
In the same multiplet a second line at 96.673 Å was previously given2 but does not appear on our spectra.
The wavelength 328.696 Å was measured in the first, second, and third order on the normal-incidence spectrograph.
The classifications of the lines 1317.62, 1331.24, and 1331.79 Å are only tentative, although they clearly belong to Al vi.
Levels are given in cm−1 units. The 2s22p4 and 2s2p5 level values are from Ref. 5 and were used to derive higher singlet and triplet levels. The quintet system is built on a theoretical value for
and has an internal consistency of less than 5 cm−1.
The 2s22p3(2P)3p3D levels are based on the tentatively classified lines at 1317.62, 1331.24, and 1331.79 Å. See Table I, footnote e.
All the higher 3d levels are determined only by their ground transitions (85–95 Å) and their energies are given to about ± 40 cm−1.
The two levels at 1 168 690 and 1 170 650 have very mixed compositions of 3D2 and 1D2.
TABLE III
Parameter values for the 2s22p33p configuration of Al5+ and comparison with HF values.
Fitted values are given in cm−1, with their standard errors in parentheses.
The value of ζ2p for 2p33s was held equal to that of ζ2p for 2p33d.
The ratio R1(2p2p, 2s3d)/R1(2p2p, 2s, 3s) was fixed at the value derived from the HF calculation.
The ratio R2(2p3d, 2p3s)/R1(2p3d, 3s2p) was fixed at the value derived from the HF calculation.
The composition is given as percentages in the LS basis. Components smaller than 3% are omitted. The LS purities are all better than 97% lor the 2s2p5 and 2s22p33s levels calculated in the same diagonalization.
The 2p3(2D)3d3S1 experimental level was not included in the parametricfit.
TABLE VII
Parameter values for the 2s2p5, 2s22p33s, and 2s22p33d configurations of Na3+ and comparison with HF values.
Fitted values are given in cm−1, with their standard errors in parentheses.
The value of ζ2p for 2p33s was held equal to that of ζ2p for 2p33d.
The ratio R1(2p2p, 2s3d)/R1(2p2p, 2s3s) was fixed at the value derived from the HF calculation.
The ratio R2(2p3d, 2p3s)/R1(2p3M, 3s2p) was fixed at the value derived from the HF calculation.
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