Two electron paramagnetic resonance spectra which were related to the excited spin-1 state of a C-Si-C complex were detected in irradiated material by means of microwave spin-dependent photoconductivity measurements. The results indicated a transformation of the complex from monoclinic to trigonal symmetry via the thermally activated motion of an interstitial Si atom around the <111> axis. A new spin-1 spectrum was observed within a temperature range of 30 to 50K.

M.M.Afanasjev, R.Laiho, L.S.Vlasenko, M.P.Vlasenko: Solid State Communications, 1997, 102[8], 595-8