“…60 Si has been measured from the atomic line spectrum of the Si 4s 3 P 0,1,2 ← 3p 2 3 P 0,1,2 transition at ϳ251 nm, 66 which lies superimposed on the SiH 3 spectrum, as is shown in the inset of In this paper, both Si and SiH 3 are detected around 250.7 nm: Si at the 4s 3 P 2 ← 3p 2 3 P 1 transition at 250.69 nm with peak absorption cross section of 4.17 ϫ 10 −17 m 2 , 66 and SiH 3 at the underlying broadband spectrum with an absorption cross section of ϳ4.9ϫ 10 −22 m 2 , as reported recently by Baklanov and Krasnoperov. 64 This new and more accurate absorption cross section of SiH 3 differs only slightly from the previously used absorption cross section of Lightfoot et al 65 …”