15min:

SHUNLIN WANG, XIANDE DING AND W. R. M. GRAHAM, Department of Physics, Texas Christian University, Fort Worth, TX 76129.

Well resolved vibrational spectra of C_n and Si_mC_n clusters have been produced by trapping products from the pulsed laser evaporation of pure carbon and silicon/carbon rods in Ar at ~ 10 K. Controlled thermally induced diffusion in the matrix has enabled the growth of large clusters. To assist in the analysis of vibrational spectra extensive carbon-13 isotopic shift measurements have been made. Objectives in this work are the identification of linear C_n clusters with n > 9 or cyclic C_n c lusters, and Si_mC_n clusters consisting of long carbon chains with terminal Si atoms.