Chemical Physics 189 (1994) 757-768


Inner-shell spectroscopy of compounds containing Si-Si bonds:
is there a localised, low-energy Si-Si resonance?
S.G. Urquharta,  J.Z. Xiongb,   A.T. Wena,1,  T.K. ShambK.M. Bainesb,
G.G.B. de Souzac,  A.P. Hitchcocka
 aDepartment of Chemistry, McMaster University, Hamilion, Ontario, Canada L8S 4MI
bDepartment of Chemistry, University of Western Ontario, London, Ontario, Canada
cInstituto de Quimica, UFRJ, Rio de Janeiro, RJ, Brazil 21910-900
Received 10 August 1994



Oscillator strengths for the Si 2p, Si 2s. and C ls excitation of tetramethylsilane, hexamethyldisilane, tetrakis(trimethylsilyl)silane, and dodecamethylcyclohexasilane have been derived from electron energy loss spectra recorded in the dipole-regime. These results are compared to the Si ls and Si 2p photoabsorption spectra of tetramethylsilane, hexamethyldisilane, tris(trimethylsilyl)silane, and tetrakis(trimethylsilyl)silane, recorded using synchrotron radiation. The spectra support the existence of a localised, low-lying state of large Si-Si character in species which contain Si-Si bonds.