
Figure 2:
a) Type 1a: BC nineknot spline least squares fit to the
dipoleallowed electronimpact collision strength data of de Heer et al. (1992). B=0.593,
C=2.251;
b) Type 1a:
ratio plot and
interpolating spline for the same dipoleallowed collision strength data. B=0.53828,
,
F_{1}=0.34300,
F_{2}=1.62850,
F_{3}=1.32310,
X_{k}=2.35670. Note the
variability of the tabular data which gives grounds for
adjustment of some values. The stateduncertainty of the data is 10% 