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

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Table 2:

The Si I experimental Stark widths.
Transition	$\lambda$ (nm)	T	$W_{\rm m}$	$W_{\rm m}^{\rm corr}$	$W_{\rm m}/W_{\rm th}$	$W_{\rm m}^{\rm corr}/W_{\rm th}$	a	b	c
$\rm 3s^23p^2~^3P_0{-} 3s3p^3~^3D^{\circ}_1$	220.798	12.5	7.2 $\pm$ 2.2	6.5 $\pm$ 2.2
$\rm 3s^23p^2 ~^3P_1{-} 3s3p^3~^3D^{\circ}_2$	221.089	12.5	7.8 $\pm$ 2.3	6.1 $\pm$ 2.3
$\rm 3s^23p^2 ~^3P_1{-}3s^23p4s ~^3P^{\circ}_2$	250.690	15.0	14.5 $\pm$ 4.1	14.1 $\pm$ 4.1	1.43	1.39	70	28
$\rm 3s^23p^2 ~^3P_0{-} 3s^23p4s ~^3P^{\circ}_1$	251.432	15.0	11.5 $\pm$ 3.2	11.2 $\pm$ 3.2	1.13	1.10		30
$\rm 3s^23p^2 ~^3P_2{-} 3s^23p4s~^3P^{\circ}_2$	251.611	15.0	12.7 $\pm$ 3.6	11.7 $\pm$ 3.6	1.25	1.15		30
$\rm 3s^23p^2 ~^3P_1{-} 3s^23p4s~^3P^{\circ}_1$	251.920	12.5	12.4 $\pm$ 3.5	11.2 $\pm$ 3.5	1.26	1.13		28
$\rm 3s^23p^2 ~^3P_1{-} 3s^23p4s~^3P^{\circ}_0$	252.411	12.5	11.9 $\pm$ 3.3	10.4 $\pm$ 3.4	1.20	1.05	72	28
$\rm 3s^23p^2 ~^3P_2{-} 3s^23p4s ~^3P^{\circ}_1$	252.851	12.5	13.0 $\pm$ 3.6	10.7 $\pm$ 3.7	1.31	1.07	68	30
$\rm 3s^23p^2 ~^1D_2{-} 3s^23p4s~^1P^{\circ}_1$	288.158	15.0	14.5 $\pm$ 4.1		1.04		54	34	62
$\rm 3s^23p^2 ~^1D_2{-} 3s^23p4s~^3P^{\circ}_1$	298.764	15.0	14.7 $\pm$ 4.1
$\rm 3s^23p^27 ~^1S_0{-} 3s^23p4s~^1P^{\circ}_1$	390.552	12.5	20.8 $\pm$ 5.8		0.85			32	18
The transition is not given	206.119	15.0	5.0 $\pm$ 1.5
The transition is not given	243.515	12.5	12.5 $\pm$ 3.5

Note 2. Our measured Si I 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. $W_{\rm m}^{\rm corr}$ denotes Stark FWHM values after corrections for self-absorption. The W (in pm) values from other experiments are also given: a (Sreckovic et al. 1998); b (Puric et al. 1974) and c (Meyer & Beck 1970) obtained at following T and N: a (T=28 500 K, $N = 1.9 \times 10^{23}$ m^-3); b (T=16 400 K, $N=1.0\times 10^{23}$ m^-3), and c (T=12 200 K, $N=1.0\times 10^{23}$ m^-3). $W_{\rm th}$ represents values presented by Griem (1974), calculated for electrons as perturbers only. Expected corrections for quasi-static broadening by ions, extrapolated from Griem (1974, p. 343), is roughly about 10% at the high densities in the experiment. Atomic data are taken from NIST.

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