Infrared spectra of 1,2-difluoroethane aggregates obtained by matrix trapping of effusive and supersonic molecular beams

Abstract

The formation of molecular aggregates was investigated by matrix ir spectroscopy. Molecular beams of 1,2-difluoroethane (DFE), either from an effusive or from a supersonic source, were deposited with an excess of argon onto a cryocooled target. (DFE) x aggregates were formed either in the seeded supersonic beam or upon deposition of a matrix with a low M A ratio. In the former case the ir matrix spectra were found to depend on the carrier gas used and to be different from the spectra obtained by deposition of effusive beams. The experimental results suggest the use of supersonic molecular beams for the selective isolation of specific aggregates in cryogenic matrices.