Posts & Comments
Author Archives: Paul Barklem
Excitation and charge transfer in low-energy hydrogen atom collisions with neutral oxygen
Barklem, P. S. Excitation and charge transfer in low-energy O+H collisions is studied; it is a problem of importance for modelling stellar spectra and obtaining accurate oxygen abundances in late-type stars including the Sun. The collisions have been studied theoretically … Continue reading
Charge exchange in galaxy clusters
Gu, Liyi; Mao, Junjie; de Plaa, Jelle; Raassen, A. J. J.; Shah, Chintan; Kaastra, Jelle S. Context. Though theoretically expected, the charge exchange emission from galaxy clusters has never been confidently detected. Accumulating hints were reported recently, including a rather … Continue reading
Posted in Atomic data applications
Leave a comment
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
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
Posted in Positions
Leave a comment
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
Posted in Atomic data production
Leave a comment
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
Posted in Atomic data production
Leave a comment
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
Posted in Atomic data production
Leave a comment
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
Posted in Atomic data production
Leave a comment
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
Posted in stellar spectroscopy
Leave a comment
astroatom.wordpress.com 