The ν6, ν7, ν8 and ν19 gas phase fundamental frequencies of 12C6H6

The fundamental wavenumbers ν6, ν7, ν8 and ν19 of gas phase benzene have been accurately determined from combination and difference bands present in the infrared spectrum. The anharmonic contribution to the vibrational energy was estimated by means of some anharmonic constants calculated by ab initio methods by Handy et al. [J. Chem. Phys. 97 (1992) 4233]. The fundamentals were checked by comparison with the overtones present in the Raman spectrum determined by Eppinger et al. [J. Mol. Struct. 266 (1992) 389].