Experimental studies of selected LS-allowed and LS-forbidden transitions of neutral sulfur from the infrared part of the spectrum

A Bacławski (1) , J Musielok (1)

1 Institute of Physics

Transition probability ratios (A forb. /A all.) for eleven line pairs, consisting of one LS-forbidden and one LS-allowed fine structure component of neutral sulfur, are reported. The LS-forbidden transitions belong to two infrared quintet- triplet multiplets: 3d 5 D o- 4p ' 3 F and 3d 5 D o- 4p ' 3 D. The LS-allowed transitions originate from the same upper terms as the LS-forbidden ones. The A ki ratios are determined by measuring the corresponding line intensity ratios (I forb. /I all.) from an arc discharge, operated in helium with some admixture of SF 6. Each selected line pair involves always the same upper energy level and thus the measured line intensity ratio is not affected by non-homogeneities of the plasma source. The transition probability ratios are compared with results of recent advanced calculations.

Mots clés: 32.30.-r; 32.70.Cs; 32.70.Fw

A Bacławski, J Musielok. Experimental studies of selected LS-allowed and LS-forbidden transitions of neutral sulfur from the infrared part of the spectrum. Journal of Physics B: Atomic, Molecular and Optical Physics, 2011, 44 (13), pp.135002. ⟨10.1088/0953-4075/44/13/135002⟩. ⟨hal-00632296⟩