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Influence of Resonances on Spectral Formation of X-Ray Lines in Fe XVII

2002; American Physical Society; Volume: 89; Issue: 1 Linguagem: Inglês

10.1103/physrevlett.89.013202

1092-0145

Guo Xin Chen, Anil K. Pradhan,

Laser-induced spectroscopy and plasma

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 XVII. By employing the Breit-Pauli R-matrix method and an 89-level eigenfunction expansion, including up to n = 4 levels, significant resonance enhancement of the collision strengths of forbidden and intercombination transitions is shown. The present results should help resolve long-standing discrepancies; in particular, the present line ratios of three benchmark diagnostic lines 3C, 3D, and 3E at 15.014, 15.265, and 15.456 A, respectively, are in excellent agreement with two independent measurements on electron-beam ion traps. Strong energy dependence in cross sections due to resonances is demonstrated.