Browsing by Author "Gorczyca, Thomas W."
Now showing items 1-8 of 8
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Carbon X-ray absorption in the local ISM: Fingerprints in X-ray Novae spectra
Gatuzz, Efrain; Ness, Jan-Uwe; Gorczyca, Thomas W.; Hasoglu, Muhammet Fatih; Kallman, Timothy R.; Garcia, Javier A. (OXFORD UNIV PRESS, 2018-09)We present a study of the C K-edge using high-resolution LETGS Chandra spectra of four novae during their super-soft-source (SSS) phase. We identified absorption lines due to C II K alpha, C III K alpha, and C III K beta ... -
A comprehensıve x-ray absorptıon model for atomıc oxygen
Gorczyca, Thomas W.; Bautista, Manuel A.; Hasoglu, Muhammet Fatih; Garcia, Javier A.; Gatuzz, Efrain; Kaastra, JS; Kallman, Timothy R.; Manson, S. T.; Mendoza, Claudio; Raassen, A. J. J.; De Vries, C. P.; Zatsarinny, Oleg (Iop Publıshıng Ltd, 2013-12-10)An analytical formula is developed to accurately represent the photoabsorption cross section of O I for all energies of interest in X-ray spectral modeling. In the vicinity of the K edge, a Rydberg series expression is ... -
K-SHELL PHOTOABSORPTION OF MAGNESIUM IONS
Hasoglu, Muhammet Fatih; Abdel-Naby, Shahin A.; Gatuzz, Efrain; Garcia, Javier A.; Kallman, Timothy R.; Mendoza, Claudio; Gorczyca, Thomas W. (IOP PUBLISHING LTD, 2014-09)X-ray photoabsorption cross sections have been computed for all magnesium ions with three or more electrons using the R-matrix method. A comparison with other available data for Mg II-Mg x shows good qualitative agreement ... -
L-shell photoionization of magnesium-like ions with new results for cl5+
Mosnier, Jean-Paul; Kennedy, Eugene T; Bizau, Jean-Marc; Cubaynes, Denis; Guilbaud, Segolene; Blancard, Christophe; Hasoglu, M. Fatih; Gorczyca, Thomas W. (MDPI, APR 2023)This study reports on the absolute photoionization cross sections for the magnesium-like Cl5+ ion over the 190-370 eV photon energy range, corresponding to the L-shell (2s and 2p subshells) excitation regime. The experiments ... -
Photoionization of confined Ca in a spherical potential well
Hasoglu, Muhammet Fatih; Zhou, Hsiao-Ling; Gorczyca, Thomas W.; Manson, S. T. (AMER PHYSICAL SOC, 2013-01-09)The photoionization cross section of the Ca atom, confined by a spherical annular potential, has been calculated using a modification to the Belfast R-matrix code for a variety of depths of the confining potential. The ... -
Photoionization of endohedral atoms using R-matrix methods: Application to Xe@C-60
Gorczyca, Thomas W.; Hasoglu, Muhammet Fatih; Manson, S. T. (AMER PHYSICAL SOC, 2012-09-21)It is demonstrated that the effect of a static cage potential on the photoionization of endohedrally enclosed atoms can be incorporated into standard R-matrix calculations using one of two independent methods. For ... -
Probing confinement resonances by photoionizing Xe inside a C-60(+) molecular cage
Phaneuf, Ronald A.; Kilcoyne, A. L. David; Aryal, N. B.; Baral, K. K.; Esteves-Macaluso, D. A.; Thomas, C. M.; Hellhund, Jonas; Lomsadze, Ramaz A.; Gorczyca, Thomas W.; Ballance, Connor P.; Manson, S. T.; Hasoglu, Muhammet Fatih; Schippers, Stefan; Mueller, Alfred (AMER PHYSICAL SOC, 2013-11-01)Double photoionization accompanied by loss of n C atoms (n = 0, 2, 4, 6) was investigated by merging beams of Xe@C-60(+) ions and synchrotron radiation and measuring the yields of product ions. The giant 4d dipole resonance ... -
X-Ray Absorption by Interstellar Atomic Gases near the K Edges of C, O, Ne, Mg, and Si and the L Edge of Fe
Hasoglu, Muhammet Fatih; Gorczyca, Thomas W. (ASTRONOMICAL SOC PACIFIC, 2018)As part of an ongoing research program, we have calculated accurate atomic photoabsorption cross sections using robust numerical methods such as the R-Matrix, multiconfiguration Hartree Fock (MCHF), and AUTOSTRUCTURE ...