The Arc Spectrum of Osmium

Albertson, Walter

doi:10.1103/physrev.45.304

Cited by 16 publications

(4 citation statements)

References 3 publications

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“…The ground state of Os I, as established by Albertson (1934), is 5d 6 6s 2 5 D 4 . The configuration 5d 6 6s 2 is strongly interacting with 5d 7 6s and 5d 8 even if no levels of this last configuration could be found in the early analyses.…”

Section: Calculations In Os Imentioning

confidence: 99%

“…Some regularities in Os I were observed very early by Meggers & Laporte (1926). The NBS compilation of Os I energy levels (Moore 1958) was based on early measurements by Albertson (1934Albertson ( , 1938 registered at the Massachussetts Institute of Technology (MIT) (4500 lines among which 2169 were classified as combinations among 234 levels). Additional measurements were made at the MIT by Van den Bosch who made Zeeman spectrograms and who, in collaboration with van Kleef, extended the spectrum of Os I (Van den Bosch 1955; Van den Bosch & van Kleef 1956) (about 6000 lines among which 2387 were classified as belonging to combinations from 257 levels).…”

Section: Atomic Structure and Spectra Of Os I And Os Iimentioning

confidence: 99%

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Transition probabilities and lifetimes in neutral and singly ionized osmium and the Solar osmium abundance

Quinet¹,

Palmeri²,

Biémont³

et al. 2006

A&A

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Radiative lifetime measurements have been performed, with a time-resolved laser-induced fluorescence technique, for 12 levels of Os I and for 9 levels of Os II. For 9 levels of Os I and 4 levels of Os II, there were no previous experimental data available. From a comparison with new theoretical calculations, taking configuration interactions and core-polarization effects into account, it has been possible to deduce oscillator strengths for 129 transitions of Os I and 137 transitions of Os II of astrophysical interest appearing in the wavelength range 180.0-870.0 nm. These results have allowed us to revise the abundance of osmium in the solar photosphere (log ε Os = 1.25 ± 0.11). The newly derived oscillator strengths have been applied as well to derive the osmium abundance in the carbon-rich metal-poor star HD 187861.

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Section: Calculations In Os Imentioning

confidence: 99%

Section: Atomic Structure and Spectra Of Os I And Os Iimentioning

confidence: 99%

Transition probabilities and lifetimes in neutral and singly ionized osmium and the Solar osmium abundance

Quinet¹,

Palmeri²,

Biémont³

et al. 2006

A&A

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“…The relative energies of the spinor states mainly of 5d 6 6s 2 ( 5 D) are documented in table 10. The most striking point here is that the reversed ordering [158,162] of the J = 3 and J = 2 states is not reproduced correctly. One possible reason might be that the adopted ANO-RCC basis set (24s21p15d11 f 4g2h/[11s10p9d8 f 4g2h]) [152] is not flexible enough.…”

Section: Sos Of Osmentioning

confidence: 82%

“…It turns out that this is an extremely complicated system. According to the experimental data [162], the spinor states mainly of 5d 6 6s 2 ( 5 D) are crossed in energy with those of 5d 7 6s 1 ( 5 F), which are further crossed with those of 5d 7 6s 1 ( 3 F), and the crossing keeps going up to even higher states such as 3 P, 3 F, and 3 H of 5d 7 6s 1 . It should be clear from the outset that the difficulty here resides mainly in electron correlation (due to change in the number of 5d electrons) rather than SOC (due to proximate radial extensions of 5d 3/2 and 5d 5/2 ).…”

Section: Sos Of Osmentioning

confidence: 97%

SOiCI and iCISO: combining iterative configuration interaction with spin–orbit coupling in two ways

Zhang¹,

Xiao²,

Liu³

2022

J. Phys.: Condens. Matter

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The near-exact iCIPT2 approach for strongly correlated systems of electrons, which stems from the combination of iterative conﬁguration interaction (iCI, an exact solver of full CI) with conﬁguration selection for static correlation and second-order perturbation theory (PT2) for dynamic correlation, is extended to the relativistic domain. In the spirit of spin separation, relativistic effects are treated in two steps: scalar relativity is treated by the inﬁnite-order, spin-free part of the exact two-component (X2C) relativistic Hamiltonian, whereas spin-orbit coupling (SOC) is treated by the ﬁrst-order, Douglas-Kroll-Hess-like SOC operator derived from the same X2C Hamiltonian. Two possible combinations of iCIPT2 with SOC are considered, i.e., SOiCI and iCISO. The former treats SOC and electron correlation on an equal footing, whereas the latter treats SOC in the spirit of state interaction, by constructing and diagonalizing an effective spin-orbit Hamiltonian matrix in a small number of correlated scalar states. Both double group and time reversal symmetries are incorporated to simplify the computation. Pilot applications reveal that SOiCI is very accurate for the spin-orbit splitting (SOS) of heavy atoms, whereas the computationally very cheap iCISO can safely be applied to the SOS of light atoms and even of systems containing heavy atoms when SOC is largely quenched by ligand ﬁelds.

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