Resolution of the forbidden (J = 0 → 0) excitation puzzle in Mg-like ions

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Table 3

Electron-impact excitation effective collision strengths for the transition 3s²¹S₀–3p²¹S₀ of Fe^{14 +} at an electron temperature of T = 2.25 × 10⁶ K.

Reference	Method	Υ

Fernández-Menchero et al. (2014b)	R-matrix	4.09 (−3)
Eissner et al. (1999) ^a	R-matrix	3.68 (−3)

Present work	AS-UDW	1.87 (−3)
Christensen et al. (1985)	UCL-DW	1.71 (−3)
Fernández-Menchero et al. (2014b)	AS-DW	1.25 (−4)
Landi (2011)	FAC-DW	1.19 (−4)
Bhatia & Mason (1997) ^b	UCL-DW	1.50 (−5)

Notes. A (B) denotes A × 10^B. ;

^(a)

Value interpolated from between 1.6 and 2.5 × 10⁶ K

^(b)

value at 2.5 × 10⁶ K.

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