Line broadening in the Si I, Si II, Si III, and Si IV spectra in the helium plasma

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Table 5:

The measured Si IV Stark widths.
Transition	$\lambda$ (nm)	T	$W_{\rm m}$	t	u
$\rm 4p ~^2P^{\circ}_{1/2}{-}5s ~^2S_{1/2}$	212.018	18.8	19.5 $\pm$ 3.9	19
$\rm 4p ~^2P^{\circ}_{3/2}{-}5s ~^2S_{1/2}$	212.747	18.8	22.2 $\pm$ 4.4	19
$\rm 4p ~^2P^{\circ}_{1/2}{-}4d ~^2D_{3/2}$	314.956	19.0	28.7 $\pm$ 3.2	66^*	14
$\rm 4p ~^2P^{\circ}_{3/2}{-}4d ~^2D_{5/2}$	316.571	19.0	29.6 $\pm$ 3.0	34	14
$\rm 4d ~^2D_{3/2}{-}5p ~^2P^{\circ}_{3/2}$	376.244	18.8	66.5 $\pm$ 13.3	58
$\rm 4d ~^2D_{3/2}{-}5p ~^2P^{\circ}_{1/2}$	377.315	18.8	56.2 $\pm$ 11.2	46
$\rm 4s ~^2S_{1/2}{-}4p ~^2P^{\circ}_{3/2}$	408.885	19.0	29.6 $\pm$ 5.3	44	12
$\rm 4s ~^2S_{1/2}{-}4p ~^2P^{\circ}_{1/2}$	411.610	19.0	26.5 $\pm$ 4.8		12
The transition is not given	251.751	19.0	35.1 $\pm$ 7.0

Note 5. Our measured Si IV Stark FWHM ( $W_{\rm m}$ in pm) at given T(in 10³ K $\pm$ 14%) and $N =1\times 10^{23}$ m $^{-3} \pm 13\%$ , with estimated accuracies. The W (in pm) values from other experiments are also given: t (Djenize et al. 1992) and u (Platisa et al. 1977) obtained at following T and N: t (T=29 000 K, $N = 1.6 \times 10^{23}$ m^-3) and u (T=25 600 K, $N = 5.8 \times 10^{22}$ m^-3). Asterisk denotes value measured by Djenize et al. (1992) at T =48 000 K and $N = 2.6 \times 10^{23}$ m^-3. Atomic data are taken from NIST.

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