Series Formulae for the He I-like Spectra Na X through Ar XVII (<i>Z</i>=11-18)

Martin, William C.

doi:10.1088/0031-8949/24/4/007

Cited by 45 publications

(8 citation statements)

References 28 publications

(23 reference statements)

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“…However, extension of the laser method to much higher Z is experimentally not feasible. Indirect measurements using x-ray and UV spectroscopy have been performed and are summarized in review articles by Martin [8] and Desequelles [9], but such measurements have not been very precise. So far there have been no measurements reported with sufficient precision to examine the theoretical predictions at high Z.…”

mentioning

confidence: 99%

Hyperfine quenching and precision measurement of the 2P03-2
Indelicato
¹
,
Birkett
²
,
Briand
³

et al. 1992
Phys. Rev. Lett.
60
4
19
0
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The hyperfine-quenched transition 2 3 /Vl 'So has been observed in heliumlike gadolinium (Gd 62+ ) in the two isotopes ,55 Gd and ,57 Gd. The lifetime for the transition (to) has been measured for each isotope and found to be r 0 (l55) = 13.43(27)x 10" l2 sec and r 0 (l57) =7.65(55)x 10" ,2 sec. From the measured lifetimes a value is inferred for the absolute value of the 2 3 Po-2 3 P\ fine-structuring splitting |A£o-i| in Gd 62+ with the result |AEo-i| = 18.57(19) eV, where the error represents 1 standard deviation. This result is compared with calculations based on the multiconfiguration Dirac-Fock method and on the unified method. PACS numbers: 32.30.Rj, 12.20.Fv, 31.30.Jv, 32.70.FwThe splittings of the I s Pj levels [l] in two-electron ions (AEJ.J) are determined largely by the electron-electron interaction. The measurement of these splittings constitutes, therefore, a test of theories of this interaction in the simplest atomic system in which it can be observed. Because of the rapid scaling of the relativistic part of this interaction with atomic number Z, measurements at high Z provide a particularly sensitive test of the relativistic theory. Calculations of the fine-structure splittings generally include the effects of relativity by a perturbation expansion in the parameter (Z«) 2 . The problems associated with this approach at high Z are illustrated by the fact that in ordinary helium (Z=2) the calculations [2] are accurate at the ppm level, whereas the most elaborate calculations [3,4] at Z=64 are accurate at only the few percent level. Accurate experimental measurements performed at high Z can therefore act to stimulate further theoretical work in including relativistic effects in the calculation of two-electron energy levels.Accurate experimental measurements of the two-electron fine-structure splittings in the I s Pj multiplet have been performed in He and Li + using radio-frequency spectroscopy [5] and laser spectroscopy [6]. The extension of laser spectroscopy to the heliumlike ion F 7+ was achieved by Myers et al.[7], who measured the interval 2 3 / > i-2 3 / > 2 (AE1.2). However, extension of the laser method to much higher Z is experimentally not feasible. Indirect measurements using x-ray and UV spectroscopy have been performed and are summarized in review articles by Martin [8] and Desequelles [9], but such measurements have not been very precise. So far there have been no measurements reported with sufficient precision to examine the theoretical predictions at high Z. In thisLetter we describe the first measurement at high Z with a precision smaller than the current theoretical accuracy.The measurement reported here is of the interval AEo.\ in the two-electron ion Gd 62+ . Gadolinium has a number of stable even-even isotopes with nuclear spin 7=0. For these isotopes, the radiative decay 2 3 /Vl '-So is strictly forbidden and the 2 3 / > o state undergoes E\ decay to the 2 3 S1 state with a calculated lifetime [10] of r(2 3 / > 0 ) =0.339xl0~9 sec. Gadolinium also has two stable isotopes ( ,55 ...

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mentioning

confidence: 99%

Hyperfine quenching and precision measurement of the 2P03-2
Indelicato
¹
,
Birkett
²
,
Briand
³

et al. 1992
Phys. Rev. Lett.
60
4
19
0
View full text Add to dashboard Cite

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“…The results shown in tables 1-3 can be used to determine the ground-state ionization energies of F VIII and Mg XI using a procedure similar to that of Seely and Feldman (1985) and Martin (1981). Following Martin (1981), the measured wavelengths for the Rydberg series are expressed in the form…”

Section: Resultsmentioning

confidence: 99%

Preparation and Time-Resolved Photoluminescence Study of CdTe/Cd_1-xMn_xTe Single Quantum Wells

Akinaga

Shirai

Takita

et al. 1993

Jpn. J. Appl. Phys.

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The wavelengths of the 1snp 1 P 0 1 -1s 2 1 S 0 transitions in the He-like Mg XI (n = 4-9) and F VIII (n = 4-8) have been measured in laser-produced plasmas. The accuracy of the present measurements (0.4-1.6 mÅ) is a large improvement over previous results. The Rydberg series is used to determine the ground-state ionization energy of F VIII and Mg XI: E ion (F VIII) = 953.96 ± 0.11 eV, E ion (Mg XI) = 1761.88 ± 0.15 eV. These experimental results are compared with theoretical data calculated by the 1/Z-expansion method and the HFR and MCDF approaches. Fairly good agreement between theory and experiment is observed with a precision up to 5 × 10 −5 . Radiative corrections to the 1s 2 1 S 0 state are analysed and compared with experiments. It is found that QED corrections to the ground-state ionization energy are significant at the present level of experimental accuracy.

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“…The nD series in neon-like ions converges to the ground level of the fluorine-like ion as n → ∞. In our previous work, the ground state ionization energies of Ne-like nickel and germanium were measured [9] following the technique in [32,33]. From the lines in the present work we derive the first and second ionization energies of Cu 19+ and the energy difference of the 2 P levels in the ground configuration in Cu 20+ according to…”

Section: Ionization Potentialsmentioning

confidence: 92%

Observations of high-n transitions in the spectra of near-neon-like copper ions from laser-produced plasmas

Fournier

Faenov

Pikuz

et al. 2002

J. Phys. B: At. Mol. Opt. Phys.

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Spectra in the 7.50-8.70 Å range from highly charged copper ions are analysed, and line identifications are made for the Na-, Ne-, F- and O-like charge states. The spectra are recorded with a spherically bent crystal spectrometer using either a mica or quartz crystal for moderate (λ/Δλ = 3000) and high (λ/Δλ = 8000) energy resolution, respectively. The plasmas from which the spectra are emitted are formed with either a Nd:glass (15 ns pulse) or a XeCl (12 ns pulse) laser. Systematic variations in the observed spectra with pulse energy are studied. Using different laser energies, and defocusing of the laser to reduce the intensity, we create plasmas with different ionization state distributions, which allows us to deconvolve blended lines from different copper ions. Line identifications are made based on relativistic atomic structure calculations that account for configuration interaction in level energies and transition rates. We use full kinetics simulations of ion emissivities, not just calculations of theoretical transition energies, to identify the strong and weak lines in crowded spectral regions. We identify 2p-nℓ transitions for Ne-like Cu19+ for 4⩽n⩽8 and 2s-np transitions for 4⩽n⩽6. We offer the first identification of high-n (n⩽8) Na-like satellites to Ne-like Rydberg resonance lines. The first and second ionization energies for Cu19+ are found, at 1689.02 and 1709.16 eV, respectively, based on our observations.

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Series Formulae for the He I-like Spectra Na X through Ar XVII (Z=11-18)

Cited by 45 publications

References 28 publications

Hyperfine quenching and precision measurement of the 2P03-2
Indelicato
¹
,
Birkett
²
,
Briand
³

et al. 1992
Phys. Rev. Lett.
60
4
19
0
View full text Add to dashboard Cite

Hyperfine quenching and precision measurement of the 2P03-2
Indelicato
¹
,
Birkett
²
,
Briand
³

et al. 1992
Phys. Rev. Lett.
60
4
19
0
View full text Add to dashboard Cite

Preparation and Time-Resolved Photoluminescence Study of CdTe/Cd_1-xMn_xTe Single Quantum Wells

Observations of high-n transitions in the spectra of near-neon-like copper ions from laser-produced plasmas

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Series Formulae for the He I-like Spectra Na X through Ar XVII (Z=11-18)

Cited by 45 publications

References 28 publications

Hyperfine quenching and precision measurement of the 2P03-2Indelicato1, Birkett2, Briand3 et al. 1992Phys. Rev. Lett.604190View full textAdd to dashboardCite

Hyperfine quenching and precision measurement of the 2P03-2Indelicato1, Birkett2, Briand3 et al. 1992Phys. Rev. Lett.604190View full textAdd to dashboardCite

Preparation and Time-Resolved Photoluminescence Study of CdTe/Cd1-xMnxTe Single Quantum Wells

Observations of high-n transitions in the spectra of near-neon-like copper ions from laser-produced plasmas

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Hyperfine quenching and precision measurement of the 2P03-2
Indelicato
¹
,
Birkett
²
,
Briand
³

et al. 1992
Phys. Rev. Lett.
60
4
19
0
View full text Add to dashboard Cite

Hyperfine quenching and precision measurement of the 2P03-2
Indelicato
¹
,
Birkett
²
,
Briand
³

et al. 1992
Phys. Rev. Lett.
60
4
19
0
View full text Add to dashboard Cite

Preparation and Time-Resolved Photoluminescence Study of CdTe/Cd_1-xMn_xTe Single Quantum Wells