Resumen de Spectroscopic studies of 13 CO2 trapped in rare gas matrices
A. M. Vasserot, B. Gauthier-Roy, L. Abouaf-Marguin, H. Chabbi
Low temperature (5 K) high resolution (0.15 and 0.03 cm−1) absorption spectra of 13CO2 have been recorded in neon, argon, krypton, and xenon matrices, in the ν3 and ν2 regions. Diffusion experiments have been performed in krypton and xenon in order to identify vibrational traps which could be responsible for the decrease and shortening of the emission observed after laser excitation: high-frequency structures in the ν3 region are assigned to dimers and a doubling of the monomer line is due to a site effect. In neon, only a double substitutional site, with a splitting of the degenerate ν2 vibration, is observed. In argon, as previously reported, a single and a double site are characterized. In krypton and xenon, where ν2 is not split, only single sites would be predicted. As one of them exhibits a ν3 line highly sensitive to temperature, we expect a large coupling with the lattice and a fast vibrational relaxation. This site is very likely the vibrational trap we are looking for.
