Revised analysis of singly ionized xenon, Xe II

Abstract

We present a revised analysis of the spectrum of singly ionized xenon, Xe II. This spectrum has been reanalyzed on the basis of the wavelength material published by Drs J. C. Boyce and C. J. Humphreys. The latter has kindly placed the original wavelength list covering the wavelength range 10 220-390 Å at our disposal. We report 161 energy levels which have been identified on the basis of classifications of 950 lines. We report the first f and g levels in Xe II. Also a number of g-factors have been determined for the first time and we give in total 75 g-factors. We have carried out least-squares fits to the even configurations and report the resulting parameter values and eigenvector compositions. A least-squares fit to the 5p46p configuration is also reported. The levels have been named in jK and for many levels also in LS coupling. The former is the better coupling scheme for Xe II. We present an analysis of the 5s photoelectron satellite spectrum of Xe based on our calculated eigenvector compositions and calculations of transition probabilities for ground state transitions as well as lifetimes for the 6p levels. The latter are compared to recent experimental measurements. A list of wavelengths for observed laser transitions showing the present classifications and a discussion of the determination of the ionization potential of Xe II concludes the paper.

Wavelengths and oscillator strengths of Xe II from the UVES spectra of four HgMn stars

“…This line, as well as all the other lines with Δλ ∼ −0.1 Å has a 6d or a 7s level as upper level. The uncertainty of the energy of these levels is on the order of 0.5 cm −1 according to Hansen & Persson (1987). Figures 1-4 show the comparison of the HR 6000 astrophysical log g f -values for Xe ii with the log g f -values taken from the NIST database and log g f -values derived from the spectra of HD 71066, 46 Aql, and HD 175640, respectively (Table B.1, Col. 5).…”

“…This energy difference corresponds to a difference of 0.1 Å in wavelengths. Saloman (2004), who performed a critical compilation of all the work on energy levels and wavelengths of Xe ii made up to that time, adopted the data from Hansen & Persson (1987) for almost all the lines of the optical region. The Saloman (2004) critical compilation is the one adopted by the NIST database.…”

Investigation of electron correlation effects in the inner-valence photoelectron spectra of argon and xenon using synchrotron radiation at high resolution

“…Fahlman et al (59,60) have also reported Xe 5 s PES spectra at quite good energy resolution, and also obtained angular distribution information over the photon-energy range 28.5-74. intensities. Figure 6 shows a theoretical spectrum obtained using the intensities as calculated by Hansen and Persson using CI methods (27,45) and convoluted with the experimental energy resolution (0.34 eV). Unlike the case of the Ar 3s CI calculations (30), the xenon calculations (27,45) included a wide range of final ion states and not just those of the principal series (i.e.…”

“…Figure 6 shows a theoretical spectrum obtained using the intensities as calculated by Hansen and Persson using CI methods (27,45) and convoluted with the experimental energy resolution (0.34 eV). Unlike the case of the Ar 3s CI calculations (30), the xenon calculations (27,45) included a wide range of final ion states and not just those of the principal series (i.e. not just those of ~S~~~~( ' D )~S (~S symmetry).…”

“…6 that good general quantitative agreement exists between theory and experiment. Since the intensities from the CI calculations (27,45) are not given as a function of photon energy, it is assumed that they are simply pole strengths (i.e. relative spectroscopic factors).…”