The Analysis of the Raman Spectra of Si2Cl6(l) and of Si2H6(g)

Abstract

The Raman spectra of Si₂H₆(g) and of Si₂Cl₆(l) have been photographed. Polarization measurements of the stronger lines of Si₂Cl₆ have been made. From a consideration of the relations among the modes of vibration of similar molecules having different symmetry, the analysis of the observed lines is facilitated by a knowledge of the assignments of the fundamental frequencies of SiH₄, HSiCl₃ and BrSiCl₃. A definite assignment is made for the three observed lines of Si₂H₆. A tentative assignment of the observed lines of Si₂Cl₆ is made and some evidence is presented for the existence of internal rotation in this molecule at room temperature.