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

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Table 4:

The measured Si III Stark widths.
Transition	$\lambda$ (nm)	T	$W_{\rm m}$	m	n	p	q	r
$\rm 3s3p ~^1P^{\circ}_1 {-} 3p^2 ~^1D_2$	254.182	19.0	$6.5\pm0.6$	30
$\rm 3s3d ~^1D_2 {-} 3p3d ~^1D^{\circ}_2$	254.609	19.0	$6.8\pm1.4$
$\rm 3s3d ~^1D_2 {-} 3s4f ~^1F^{\circ}_3$	255.921	19.0	$6.8\pm1.4$
$\rm 3p3d ~^1D^{\circ}_2 {-} 3p4p ~^1P_1$	264.079	19.0	$24.2\pm4.8$
$\rm 3s4f ~^3F^{\circ}_2 {-} 3s6g ~^3G_3$	303.473	18.8	$17.5\pm3.5$
$\rm 3s3d ~^3D_3 {-} 3s4p ~^3P^{\circ}_2$	308.624	18.8	$31.1\pm3.5$
$\rm 3s3d ~^3D_2 {-} 3s4p ~^3P^{\circ}_1$	309.342	18.8	$28.5\pm3.0$
$\rm 3s3d ~^3D_1 {-} 3s4p ~^3P^{\circ}_0$	309.683	18.8	$27.7\pm3.0$	29
$\rm 3s4d ~^1D_2 {-} 3p3d ~^1P^{\circ}_1$	318.513	18.8	$27.7\pm5.5$
$\rm 3p3d ~^3F^{\circ}_3 {-} 3s5g ~^3G_4$	319.650	18.8	$32.3\pm6.5$
$\rm 3s4p ~^3P^{\circ}_0 {-} 3s5s ~^3S_1$	323.050	19.0	$43.3\pm8.6$				18
$\rm 3s4p ~^3P^{\circ}_1 {-} 3s5s ~^3S_1$	323.395	19.0	$44.6\pm8.9$				19
$\rm 3s4p ~^3P^{\circ}_2 {-} 3s5s ~^3S_1$	324.162	19.0	$48.1\pm9.6$	73			19
$\rm 3s4d ~^3D_2{-}3s5f ~^3F^{\circ}_{3}$	348.691	19.0	$50.2\pm10.0$
$\rm 3s4p ~^1P^{\circ}_1 {-} 3s4d ~^1D_2$	359.047	18.8	$86.6\pm17.3$
$\rm 3s4p ~^3P^{\circ}_0 {-} 3s4d ~^3D_1$	379.141	18.8	$74.3\pm13.8$		68	54	20
$\rm 3s4p ~^3P^{\circ}_1 {-} 3s4d ~^3D_2$	379.611	18.8	$79.7\pm13.9$		68	48
$\rm 3s4p ~^3P^{\circ}_2 {-} 3s4d ~^3D_3$	380.654	18.8	$78.4\pm14.6$	118	69	47
$\rm 3s4f ~^1F^{\circ}_3 {-} 3s5g ~^1G_4$	392.447	19.0	$84.6\pm16.9$	163
$\rm 3p^2 ~^1S_0 {-} 3s4p ~^1P^{\circ}_1$	433.850	19.0	$26.9\pm5.3$
$\rm 3s4s ~^3S_1 {-} 3s4p ~^3P^{\circ}_2$	455.262	19.0	$51.2\pm9.2$				18	48
$\rm 3s4s ~^3S_1 {-} 3s4p ~^3P^{\circ}_1$	456.782	19.0	$54.2\pm9.8$				18	56
$\rm 3s4s ~^3S_1 {-} 3s4p ~^3P^{\circ}_0$	457.476	19.0	$48.5\pm9.3$			306	18
$\rm 3s4d ~^1D_2 {-} 3s5f ~^1F^{\circ}_3$	471.665	19.0	$181\pm36$	277
$\rm 3s4f ~^3F^{\circ}_2 {-} 3s5g ~^3G_3$	481.333	19.0	$398\pm79$	438	398
$\rm 3s4f ~^3F^{\circ}_3 {-} 3s5g ~^3G_4$	481.972	19.0	$423\pm84$	438	425
$\rm 3s4f ~^3F^{\circ}_4 {-} 3s5g ~^3G_5$	482.897	19.0	$421\pm84$	438	405
$\rm 3s4s ~^1S_0 {-} 3s4p ~^1P^{\circ}_1$	573.973	19.0	$98.2\pm20.0$		87

Note 4. Our measured Si III 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: m (Djenize et al. 1992), n (Gonzalez et al. 2000), p (Kusch & Schröder 1982), q (Platisa et al. 1977), and r (Puric et al. 1974) obtained at following T and N: m (T=4800 K, $N = 2.6 \times 10^{23}$ m^-3), n (T=19 000 K, $N=1.0\times 10^{23}$ m^-3), p (T=23 500 K, $N=1.0\times 10^{23}$ m^-3), q (T=25 600 K, $N = 5.8 \times 10^{22}$ m^-3), and r (T=8 700 K, $N=1.0\times 10^{23}$ m^-3). Atomic data are taken from NIST.

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