Matrix isolation spectra and structures of unstable molecules

Techniques for obtaining infrared, ultraviolet-visible, and Raman spectra of unstable or reactive molecular species trapped in frozen inert gases are described. Monomeric and small multimeric clusters were generated from vapors of high temperature solids and free radicals produced by electric discharge and vacuum-ultraviolet photolysis. Vaporization and condensation products of silicon monoxide were examined in detail. Infrared and Raman spectra were recorded for the species SiO, Si2O2, and Si2O3, and the transition from molecular to bulk clusters was followed through extended diffusion and reaction in the matrix solid. The molecular structures are analyzed. The implications to interstellar chemistry are discussed. Experiments on co-condensation of vaporization products of solid Mg and SiO were begun. Initial results indicated formaton of MgSiO, MgOSi, Mg2SiO, and MgSi2O2 species. Diffusion studies indicated a transition to a bulk solid with an infrared spectrum similar to that of interstellar media. Resonance Raman spectra of the trapped products of solid tin and lead vaporization were obtained. Infrared spectra of CO3 were obtained.