Si

Si II: 

ULTRAVIOLET EMISSION LINES of Si II in QUASARS – INVESTIGATING the Si II DISASTER. / Laha, Sibasish; Keenan, Francis P.; Ferland, Gary J.; Ramsbottom, Catherine A.; Aggarwal, Kanti M. In: Astrophysical Journal, Vol. 825, No. 1, 28, 27.06.2016. http://dx.doi.org/10.3847/0004-637X/825/1/28

Ultraviolet emission lines of Si II in cool star and solar spectra. / Laha, Sibasish; Keenan, Francis P.; Ferland, Gary J.; Ramsbottom, Catherine A.; Aggarwal, Kanti M.; Ayres, Thomas R.; Chatzikos, Marios; Van Hoof, Peter A M; Williams, Robin J R. In: Monthly Notices of the Royal Astronomical Society, Vol. 455, No. 3, 21.01.2016, p. 3405-3412. http://dx.doi.org/10.1093/mnras/stv2566

Si VIII: 

A comparison of theoretical Si VIII emission line ratios with observations from SERTS. / Keenan, Francis; Ramsbottom, Catherine; Katsiyannis, A.C.; Bell, K.L.; Brosius, J.W.; Davila, J.M.; Thomas, R.J. In: Solar Physics, Vol. 219, No. 2, 02.2004, p. 251-263. https://doi.org/10.1023/B:SOLA.0000023001.61242.e1

Effective collision strengths for electron impact excitation of Si VIII. / Keenan, Francis; Ramsbottom, Catherine; Bell, K.L.; Matthews, A. In: Atomic Data and Nuclear Data Tables, Vol. 85, No. 1, 09.2003, p. 69-82. https://doi.org/10.1016/S0092-640X(03)00055-X

Electron collisional excitation of Si VIII (1s(2)2s(2)2p(3) S_4(3/2)o-D-2(3/2,5/2)o, P-2(1/2,3/2)o fine structure transitions. / Bell, Kenneth; Ramsbottom, Catherine; Matthews, A. In: Monthly Notices of the Royal Astronomical Society, Vol. 322(4), No. 4, 21.04.2001, p. 779-784. http://dx.doi.org/10.1046/j.1365-8711.2001.04183.x