M. Wang, A. Arnesen, R. Hallin, F. Heijkenskjöld, A. Langereis, M. O. Larsson, C. Nordling, and A. Wännström, "Collision-based spectroscopy of Xe viii Rydberg states," J. Opt. Soc. Am. B 13, 1650-1658 (1996)
The photon emission from 10q keV ( 8; collisions has been recorded in the 35–800-nm wavelength region. Especially in the spectra we observed many unreported lines, of which 68 were ascribed to Xe viii transitions involving Rydberg states. As a result of this, we established 32 new energy levels and revised the energies of 6 previously reported levels. The Xe viii ionization energy 854 755±33 cm-1 was determined with improved accuracy. Furthermore, we derived Ritz formula coefficients for the observed Rydberg series and the core dipole and quadrupole polarizabilities. The analysis was supported by Hartree–Fock calculations.
M. Wang, A. Arnesen, R. Hallin, F. Heijkenskjöld, A. Langereis, M. O. Larsson, C. Nordling, and A. Wännström, "Collision-based spectroscopy of Xe viii Rydberg states," J. Opt. Soc. Am. B 14, 1516-1516 (1997) https://opg.optica.org/josab/abstract.cfm?uri=josab-14-6-1516
M. Wang, A. Arnesen, R. Hallin, F. Heijkenskjöld, M. O. Larsson, A. Wännström, A. G. Trigueiros, and A. V. Loginov J. Opt. Soc. Am. B 14(12) 3277-3281 (1997)
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A dash means that the line was not visible in the spectrum.
Observed vacuum wavelengths. For previously classified lines the wavelengths are taken from the respective reference.
HFR-calculated vacuum wavelengths.
Intensity of lines observed following Xe8+ collisions with Na, Ar, and He.
Δ = σobs - σlevels, where σlevels is the transition energy obtained from levels given in Refs. 2, 6, 7, and 9 and new levels given in Table 3.
Tentative assignment.
The differences between the experimental and the theoretical (semiempirical) energies (columns 3–5) should be regarded as supports for the undertaken line assignments and not as a comparison between the HFR calculations and the semiempirical results. One easily sees that one can much improve the HFR values by shifting all levels of a common n shell with the same amount of energy.
The experimental energies are based on levels given in Refs. 2, 6, and 9 and wavelengths given in Table 2. : HFR calculated energies. where and the δ are from the Ritz formula (Table 4).
HFR calculations.
Revision of energy given in Ref. 6.
Tentative.
Revision of energies given in Ref. 5.
Table 4
Coefficients of the Ritz Formula δ = a + b/n*2 + c/n*4 for the ns, np, nd, nf, ng, nh, ni, and nk Series in Xe viiia
Series
a
b
c
ns2S
2.059 (2)
0.27 (8)
2.8 (5)
np2P1/2
1.821 (8)
0.7 (3)
2 (3)
np2P3/2
1.783 (8)
0.7 (3)
2 (3)
nd2D3/2
1.327 (2)
0.6 (1)
6 (1)
nd2D5/2
1.312 (4)
0.8 (2)
4 (2)
nf2F5/2
0.583 (1)
-0.24 (5)
-2.0 (5)
nf2F7/2
0.581 (2)
-0.3 (1)
-1 (1)
ng2G
0.0766 (4)
-1.46 (3)
8.5 (6)
nh2H
0.0091 (5)
-0.09 (2)
–
ni2I
0.0019 (5)
–
–
nk2K
0.0005 (5)
–
–
The ionization energy used in this derivation, 854 755 ± 33 cm-1, is obtained from the polarization formula fit. The uncertainties are from the least-squares fit.
Tables (4)
Table 1
Experimental Conditions and Related Data for the Experimental Series Described in this Papera
A dash means that the line was not visible in the spectrum.
Observed vacuum wavelengths. For previously classified lines the wavelengths are taken from the respective reference.
HFR-calculated vacuum wavelengths.
Intensity of lines observed following Xe8+ collisions with Na, Ar, and He.
Δ = σobs - σlevels, where σlevels is the transition energy obtained from levels given in Refs. 2, 6, 7, and 9 and new levels given in Table 3.
Tentative assignment.
The differences between the experimental and the theoretical (semiempirical) energies (columns 3–5) should be regarded as supports for the undertaken line assignments and not as a comparison between the HFR calculations and the semiempirical results. One easily sees that one can much improve the HFR values by shifting all levels of a common n shell with the same amount of energy.
The experimental energies are based on levels given in Refs. 2, 6, and 9 and wavelengths given in Table 2. : HFR calculated energies. where and the δ are from the Ritz formula (Table 4).
HFR calculations.
Revision of energy given in Ref. 6.
Tentative.
Revision of energies given in Ref. 5.
Table 4
Coefficients of the Ritz Formula δ = a + b/n*2 + c/n*4 for the ns, np, nd, nf, ng, nh, ni, and nk Series in Xe viiia
Series
a
b
c
ns2S
2.059 (2)
0.27 (8)
2.8 (5)
np2P1/2
1.821 (8)
0.7 (3)
2 (3)
np2P3/2
1.783 (8)
0.7 (3)
2 (3)
nd2D3/2
1.327 (2)
0.6 (1)
6 (1)
nd2D5/2
1.312 (4)
0.8 (2)
4 (2)
nf2F5/2
0.583 (1)
-0.24 (5)
-2.0 (5)
nf2F7/2
0.581 (2)
-0.3 (1)
-1 (1)
ng2G
0.0766 (4)
-1.46 (3)
8.5 (6)
nh2H
0.0091 (5)
-0.09 (2)
–
ni2I
0.0019 (5)
–
–
nk2K
0.0005 (5)
–
–
The ionization energy used in this derivation, 854 755 ± 33 cm-1, is obtained from the polarization formula fit. The uncertainties are from the least-squares fit.
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