Absorption lines of Neutral Silicon in the Solar Spectrum

We present a comprehensive description of the occurrence of Si I lines in the solar spectrum in the wavelength range 2935–25 578 Å. Theoretical equivalent widths are calculated using a detailed curve of growth method and the $$f$$-values given in the preceding paper. Si I is found to account for, or is an important contributor in, about 550 solar lines. Some 200 of these are new identifications. Many more Si I lines of moderate strength will appear in the solar spectrum but are masked by telluric absorption. It has been found possible to locate 32 new energy levels in Si I, mostly in the $$7f$$, $$8f$$ and $$9f$$ configurations. Transitions to these levels account for some previously unidentified, but moderately strong, solar lines.