Extended and revised analysis of singly ionized tin: Sn II

Energy Levels of Singly-Ionized Platinum

The analysis of Pt II is extended by using accurate wavelength measurements by Sansonetti et al. Forty-three new even and 104 new odd levels have been found. The Slater-Condon parametric method is used for the interpretation of the 5d9, 5d86s, and 5d76s2 low even configurations and the 5d8(7s+6d) high even configurations with root mean square deviations smaller than 80 cm-1. The importance of t...

The Spectra of Singly and Doubly Ionized Germanium (ge Ii and Iii).

Critically Evaluated Energy Levels and Spectral Lines of Singly Ionized Indium (In II)

A comprehensive list of the best measured wavelengths in the In II spectrum has been compiled. Uncertainties of the wavelength measurements have been analyzed, and existing inconsistencies have been resolved. An optimized set of fine-structure energy levels that fits all observed wavelengths has been derived. Uncertainties of the energy level values have been reduced by an order of magnitude. A...

An N-heterocyclic carbene adduct of diatomic tin, :Sn=Sn:.

Reduction of an N-heterocyclic carbene (NHC) adduct of SnCl(2), viz. [(IPr)SnCl(2)] (IPr = :C{N(Dip)C(H)}(2); Dip = 2,6-diisopropylphenyl), with a magnesium(I) dimer, has afforded the first NHC complex of a row 5 element in its diatomic form, [(IPr)Sn=Sn(IPr)]; a computational analysis of the complex indicates that it comprises a singlet state, doubly bonded tin(0) fragment, :Sn=Sn:, datively b...

Lyα/Hα Ratio of Singly Ionized Helium in Quasars

He ii Lyα λ304/Hα λ1640 emission lines are mainly produced by recombination, and their canonical ratio of ∼ 10 may be a sensitive reddening indicator. We obtain the high S/N optical spectra of two quasars and combine them with the far-UV spectra that show the He ii λ304 emission. For HS 1700+64, the He ii λ1640 emission is not detected, and an upper limit to it sets the ratio greater than 20. T...