Ultraviolet spectroscopy of the B2A’ and C2A‘ states of FCO
摘要:
Gas phase uv spectra of FCO obtained from the flash photolysis of F2, or F2CO, in the presence of CO are presented. The spectrum consists of three prominent progressions assigned to the B and C states of FCO and a fourth, weaker, progression which may belong to the second excited 2A′ state. Analysis of the B 2A′ state progressions provides vibrational frequencies of ω1=1180±35 cm−1 and ω2=770±30 cm−1 and a zero point energy in the range 24 000<T0<27 000 cm−1. The spectrum of the C 2A″ state yields ω1=1458±6 cm−1 and ω2=651±5 cm−1 and a zero point energy of T0=28 500±25 cm−1. The electronic energies and vibrational frequencies are compared to recent ab initio calculations.