Table 1: Stark broadening parameters for Sii spectral lines. This table shows electron-, proton-, and ionized helium-impact broadening parameters for Sii for a perturber density of 10¹⁴ cm^-3 and temperatures from 2500 up to 50 000 K. The quantity C (given in Å cm^-3), when divided by the corresponding full width at half maximum, gives an estimate for the maximum perturber density for which tabulated data may be used. The asterisk identifies cases for which the collision volume multiplied by the perturber density (the condition for validity of the impact approximation) lies beetwen 0.1 and 0.5. For higher densities, the isolated line approximation used in the calculations breaks down. FWHM(Å) denotes full line width at half maximum in Å, while SHIFT(Å) denotes line shift in Å.
Perturbers are: Electrons Protons Helium ions

Transition T(K) FWHM(Å) SHIFT(Å) FWHM(Å) SHIFT(Å) FWHM(Å) SHIFT(Å)

SiI $\rm 4s{-}5p$ 2500 0.509E-02 0.333E-02 0.160E-02 0.701E-03

$\rm ^1P{-}^1D$ 5000 0.581E-02 0.409E-02 0.172E-02 0.898E-03

5948.55 A 10 000 0.652E-02 0.381E-02 0.183E-02 0.109E-02 0.167E-02 0.851E-03

C = 0.36E+19 20 000 0.740E-02 0.328E-02 0.194E-02 0.127E-02 0.175E-02 0.101E-02

30 000 0.811E-02 0.271E-02 0.202E-02 0.139E-02 0.181E-02 0.111E-02

50 000 0.903E-02 0.212E-02 0.213E-02 0.153E-02 0.188E-02 0.123E-02

SiI $\rm 3p^3{-}5f$ 2500 0.967E-01 -0.576E-01 0.175E-01 -0.145E-01 *0.145E-01 -0.114E-01

$\rm ^3D_3{-}^3D_3$ 5000 0.108 -0.624E-01 0.196E-01 -0.168E-01 0.160E-01 -0.134E-01

6142.48 Å 10 000 0.120 -0.609E-01 0.219E-01 -0.192E-01 0.178E-01 -0.154E-01

C = 0.52E+16 20 000 0.132 -0.472E-01 0.247E-01 -0.219E-01 0.198E-01 -0.176E-01

30 000 0.140 -0.400E-01 0.266E-01 -0.235E-01 0.211E-01 -0.189E-01

50 000 0.147 -0.326E-01 0.294E-01 -0.258E-01 0.228E-01 -0.208E-01

SiI $\rm 3p^3{-}5f$ 2500 0.905E-01 -0.622E-01 0.184E-01 -0.152E-01 *0.151E-01 -0.120E-01

$\rm ^3D_3{-}^3G_4$ 5000 0.102 -0.707E-01 0.204E-01 -0.177E-01 0.168E-01 -0.141E-01

6155.13 Å 10 000 0.112 -0.706E-01 0.228E-01 -0.203E-01 0.187E-01 -0.162E-01

C = 0.20E+17 20 000 0.121 -0.571E-01 0.255E-01 -0.231E-01 0.208E-01 -0.185E-01

30 000 0.129 -0.482E-01 0.273E-01 -0.248E-01 0.221E-01 -0.200E-01

50 000 0.137 -0.392E-01 0.298E-01 -0.272E-01 0.240E-01 -0.219E-01

**Table 1:** Stark broadening parameters for Sii spectral lines. This table shows electron-, proton-, and ionized helium-impact broadening parameters for Sii for a perturber density of 10¹⁴ cm^-3 and temperatures from 2500 up to 50 000 K. The quantity C (given in Å cm^-3), when divided by the corresponding full width at half maximum, gives an estimate for the maximum perturber density for which tabulated data may be used. The asterisk identifies cases for which the collision volume multiplied by the perturber density (the condition for validity of the impact approximation) lies beetwen 0.1 and 0.5. For higher densities, the isolated line approximation used in the calculations breaks down. *FWHM*(Å) denotes full line width at half maximum in Å, while *SHIFT*(Å) denotes line shift in Å.
Perturbers are:	Electrons	Protons	Helium ions
Transition	T(K)	FWHM(Å)	SHIFT(Å)	FWHM(Å)	SHIFT(Å)	FWHM(Å)	SHIFT(Å)
SiI $\rm 4s{-}5p$	2500	0.509E-02	0.333E-02	0.160E-02	0.701E-03
$\rm ^1P{-}^1D$	5000	0.581E-02	0.409E-02	0.172E-02	0.898E-03
5948.55 A	10 000	0.652E-02	0.381E-02	0.183E-02	0.109E-02	0.167E-02	0.851E-03
C = 0.36E+19	20 000	0.740E-02	0.328E-02	0.194E-02	0.127E-02	0.175E-02	0.101E-02
	30 000	0.811E-02	0.271E-02	0.202E-02	0.139E-02	0.181E-02	0.111E-02
	50 000	0.903E-02	0.212E-02	0.213E-02	0.153E-02	0.188E-02	0.123E-02
SiI $\rm 3p^3{-}5f$	2500	0.967E-01	-0.576E-01	0.175E-01	-0.145E-01	*0.145E-01	-0.114E-01
$\rm ^3D_3{-}^3D_3$	5000	0.108	-0.624E-01	0.196E-01	-0.168E-01	0.160E-01	-0.134E-01
6142.48 Å	10 000	0.120	-0.609E-01	0.219E-01	-0.192E-01	0.178E-01	-0.154E-01
C = 0.52E+16	20 000	0.132	-0.472E-01	0.247E-01	-0.219E-01	0.198E-01	-0.176E-01
	30 000	0.140	-0.400E-01	0.266E-01	-0.235E-01	0.211E-01	-0.189E-01
	50 000	0.147	-0.326E-01	0.294E-01	-0.258E-01	0.228E-01	-0.208E-01
SiI $\rm 3p^3{-}5f$	2500	0.905E-01	-0.622E-01	0.184E-01	-0.152E-01	*0.151E-01	-0.120E-01
$\rm ^3D_3{-}^3G_4$	5000	0.102	-0.707E-01	0.204E-01	-0.177E-01	0.168E-01	-0.141E-01
6155.13 Å	10 000	0.112	-0.706E-01	0.228E-01	-0.203E-01	0.187E-01	-0.162E-01
C = 0.20E+17	20 000	0.121	-0.571E-01	0.255E-01	-0.231E-01	0.208E-01	-0.185E-01
	30 000	0.129	-0.482E-01	0.273E-01	-0.248E-01	0.221E-01	-0.200E-01
	50 000	0.137	-0.392E-01	0.298E-01	-0.272E-01	0.240E-01	-0.219E-01

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