49 citations · 208 across the 10 of their papers we have counts for
10 papers
Highly Excited Core Resonances in Photoionization of Fe XVII : Implications for Plasma Opacities
Sultana N. Nahar, Anil K. Pradhan, Guo-Xin Chen +1
A comprehensive study of high-accuracy photoionization cross sections is carried out using the relativistic Breit-Pauli R-matrix (BPRM) method for (hnu + Fe XVII --> Fe XVIII + e).…
A New Calculation of Ne IX Line Diagnostics
Randall K. Smith, Guo-Xin Chen, Kate Kirby +1
We describe the effect that new atomic calculations, including fully-relativistic R-matrix calculations of collisional excitation rates and level-specific dielectronic and radiativ…
Electron distributions in X-Ray plasmas: spectral diagnostics with the 3s/3d line ratio in Fe XVII
Guo-Xin Chen, Anil K. Pradhan
Efforts to benchmark astrophysical observations with X-ray laboratory measurements have been stymied by observed and measured differences of up to a factor of two in the ratio '3s/…
X-ray absorption via K-alpha resonance complexes in oxygen ions
Anil K. Pradhan, Guo Xin Chen, Franck Delahaye +2
The K-alpha resonance complexes in oxygen ions O I - O VI are theoretically computed and resonance oscillator strengths and wavelengths are presented. The highly resolved photoioni…
Breit-Pauli R-matrix calculations for electron impact excitation of Fe XVII: a benchmark study
Guo-Xin Chen, Anil K. Pradhan, W. Eissner
A comprehensive study of relativistic and resonance effects in electron impact excitation of (e+Fe XVII) is carried out using the BPRM method in the relativistic close coupling app…
X-Ray Resonance Opacity of Oxygen and Iron in AGN MCG--6-30-15
Anil K. Pradhan, Guo-Xin Chen, Franck Delahaye +2
Theoretical differential oscillator strengths related to monochromatic opacity due to K- and L-shell absorption from oxygen and iron ions are directly compared with the Chandra and…
Influence of Resonances on Spectral Formation of X-Ray Lines in Fe XVII
Guo-Xin Chen, Anil K. Pradhan
New theoretical results from large-scale relativistic close coupling calculations reveal the precise effect of resonances in collisional excitation of x-ray lines of Ne-like Fe XVI…
Relativistic fine structure and resonance effects in electron-ion recombination and excitation of (e + C IV)
Anil K. Pradhan, Guo Xin Chen, Sultana N. Nahar +1
Relativistic close coupling calculations are reported for unified electronic recombination of (e + C IV) including non-resonant and resonant recombination processes, radiative and…
Atomic data from the Iron Project.XLIV. Transition probabilities and line ratios for Fe VI with fluorescent excitation in planetary nebulae
Guo Xin Chen, Anil K. Pradhan
Relativistic atomic structure calculations for electric dipole E1, electric quadrupole E2 and magnetic dipole M1 transition probabilities among the first 80 fine-structure levels o…
Fluorescent Excitation of Spectral Lines in Planetary Nebulae
Guo Xin Chen, Anil K. Pradhan
Fluorescent excitation of spectral lines is demonstrated as a function of temperature-luminosity and the distance of the emitting region from the central stars of planetary nebulae…