Author Archives: Paul Barklem

Line Ratios for Solar Wind Charge Exchange with Comets

Mullen, P. D.; Cumbee, R. S.; Lyons, D.; Gu, L.; Kaastra, J.; Shelton, R. L.; Stancil, P. C. Charge exchange (CX) has emerged in X-ray emission modeling as a significant process that must be considered in many astrophysical environments—particularly comets. … Continue reading

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The impact of atomic data selection on nebular abundance determinations

Juan de Dios, Leticia; Rodríguez, Mónica Atomic data are an important source of systematic uncertainty in our determinations of nebular chemical abundances. However, we do not have good estimates of these uncertainties since it is very difficult to assess the … Continue reading

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PhD position in atomic astrophysics

Malmö University and Lund Observatory jointly announce a PhD position in Atomic Astrophysics. The candidate will work within the project ‘Experimental and Computational Atomic Astrophysics’ For information and online application, please see the link below. http://web103.reachmee.com/ext/I005/1015/job?site=6&lang=SE&validator=df9f5539db53eab37b3e3087d2a2669b&job_id=238 The deadline for application … Continue reading

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Testing atomic collision theory with the two-photon continuum of astrophysical nebulae

Guzmán, F.; Badnell, N. R.; Chatzikos, M.; van Hoof, P. A. M.; Williams, R. J. R.; Ferland, G. J. Accurate rates for energy-degenerate l-changing collisions are needed to determine cosmological abundances and recombination. There are now several competing theories for … Continue reading

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K-shell photoionization of O4 + and O5 + ions: experiment and theory

McLaughlin, B. M.; Bizau, J.-M.; Cubaynes, D.; Guilbaud, S.; Douix, S.; Shorman, M. M. Al; Ghazaly, M. O. A. El; Sakho, I.; Gharaibeh, M. F. Absolute cross-sections for the K-shell photoionization of Be-like (O4 +) and Li-like (O5 +) atomic … Continue reading

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Electron impact excitation for He-like ions with Z = 20-42

Si, R.; Li, S.; Wang, K.; Guo, X. L.; Chen, Z. B.; Yan, J.; Chen, C. Y.; Brage, T.; Zou, Y. M. Aims: Spectral lines of He-like ions are among the most prominent features in X-ray spectra from a large … Continue reading

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Extended Calculations of Spectroscopic Data: Energy Levels, Lifetimes, and Transition Rates for O-like Ions from Cr xvii to Zn xxiii

Wang, K.; Jönsson, P.; Ekman, J.; Gaigalas, G.; Godefroid, M. R.; Si, R.; Chen, Z. B.; Li, S.; Chen, C. Y.; Yan, J. Employing two state-of-the-art methods, multiconfiguration Dirac–Hartree–Fock and second-order many-body perturbation theory, the excitation energies and lifetimes for … Continue reading

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