Table 2: Comparison of HFR K $\alpha _{2}$/K $\alpha _{1}$ ratios for Fe ions ( $18\leq N\leq 25$) with experiment and previous theoretical estimates.
N Ion HFR1a HFR2 b Expt. Theory
18 Fe  IX 0.7000 0.5912    
19 Fe  VIII 0.5780 0.6015    
20 Fe  VII 0.4541 0.5821    
21 Fe  VI 0.5545 0.5538    
22 Fe  V 0.5852 0.5346    
23 Fe  IV 0.4426 0.5143    
24 Fe  III 0.4438 0.5032    
25 Fe  II 0.4476 0.4969 0.51(2)c 0.5107g
        0.507(10)d  
        0.506e  
        0.4998f  
a Includes only the decay lines from the K-vacancy levels listed in Table 3.
b Includes all the decay lines from the $[{\rm 1s}]({\rm 3d+4s})^{M+1}$ complex.
c Hölzer et al. (1997).
d McCrary et al. (1971).
e Salem & Wimmer (1970).
f Williams (1933).
g Scofield (1974).

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