Author Archives: Paul Barklem

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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New Fe i Level Energies and Line Identifications from Stellar Spectra. II. Initial Results from New Ultraviolet Spectra of Metal-poor Stars

Peterson, Ruth C.; Kurucz, Robert L.; Ayres, Thomas R. The Fe i spectrum is critical to many areas of astrophysics, yet many of the high-lying levels remain uncharacterized. To remedy this deficiency, Peterson & Kurucz identified Fe i lines in … Continue reading

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Radiative data for highly excited 3d84d levels in Ni II from laboratory measurements and atomic calculations

Hartman, H.; Engström, L.; Lundberg, H.; Nilsson, H.; Quinet, P.; Fivet, V.; Palmeri, P.; Malcheva, G.; Blagoev, K. Aims: This work reports new experimental radiative lifetimes and calculated oscillator strengths for transitions from 3d84d levels of astrophysical interest in singly … Continue reading

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