Energy Levels and Observed Spectral Lines of Krypton, Kr I through Kr XXXVI

Abstract

The energy levels and observed spectral lines of the krypton atom, in all stages of ionization for which experimental data are available, have been compiled. Sufficient data were found to generate level and line tables for Kr I–Kr X and Kr XVIII–Kr XXXVI. For Kr XXXV and Kr XXXVI and most of Kr XXXIV theoretical values are compiled for the energy levels. In all of the other stages a few lines, some of which may be only tentative classifications, are reported. In addition for Kr I, separate tables of energy levels are tabulated for the isotopes Kr86 and Kr84. Experimental g factors are included for Kr I and Kr II. A value, either experimental, semiempirical, or theoretical, is included for the ionization energy of each ion.

Effect of electronic angular momentum exchange on photoelectron anisotropy following the two-color ionization of krypton atoms

“…The VUV light was used to prepare a series of intermediate electronic states which are listed in Table I. 24 In these experiments, we used a 200 l/mm grating and 50 µm exit slits to provide a moderate resolution of ~4 meV at 12 eV, with a photon flux of ~10 12 photons/second. The SR photon energy was tuned to the intermediate resonances by monitoring the VUV fluorescence that reached the spectrometer's microchannel plates.…”

Extended calculations of energy levels, radiative properties, A, B hyperfine interaction constants, and Landé g -factors for oxygen-like Kr XXIX

“…The deviations from our MCDF results for these three NIST values are 7000 -24000 cm −1 , while the corresponding differences of our MCDF and MBPT values are within 1200 cm −1 . The differences of the present results from these NIST values are significantly larger than the NIST uncertainties (1 900 cm −1 -2 500 cm −1 ) [11], which implies that either the identifications of observed spectra are incorrect or a systematic error exists in both the MCDF and MBPT calculations. Further precise measurements and systematic elaborate calculations along the sequence (similar as those performed in Ref.…”

“…The NIST observations are available for seven levels, and agreement of the NIST values and the present MCDF excitation energies is well within the NIST uncertainties (1 000 cm −1 -1 500 cm −1 ) [11]. The other two theoretical results (GRASP1 and FAC) reported by Aggarwal et al [20] are not accurate enough to meet the requirement of line identification and interpretation, due to limited configuration interaction effects included in their calculations.…”

“…The NIST excitation energies have an uncertainty of ≤1 000 cm −1 for the n = 2 levels except for the 2s 2 2p 4 3 P 0 and 2s2p 5 3 P 0 levels with 1 500 cm −1 uncertainty. The NIST excitation energies have 1 900 cm −1 -2 500 cm −1 uncertainty for the n ≥ 3 levels [11] Table 4. Wavelengths (λ, in vacuum, Å), transition rates (A, in s −1 ), oscillator strengths (g f , dimensionless) and line strengths (S , Table 6.…”

“…Experimental determinations of some levels of Olike Kr reported by Wyart and the TFR Group [1], Dietrich et al [8], Denne et al [9], and Rice et al [10] were compiled by Saloman [11] incorporated in the Atomic Spectra Database (ASD) of the National Institute of Standards and Technology (NIST) [12]. Using an electron-beam ion trap, Kink et al [13] reported a few spectral lines for the (1s 2 )2s 2 2p 3 3l − 2s 2 2p 4 transitions of Kr XXIX with a microcalorimeter detector.…”