Infrared matrix isolation spectra of the H2F2 dimer

Infrared spectra of the H2F2 dimer isolated in Ar, N2, CO, and several mixed matrices, are reported and values for all six fundamental vibration frequencies are given for the Ar-isolated dimer. Evidently due to molecular nonrigidity, the relative intensity of ν1 and ν2 of the H2F2 dimer depend strongly on the matrix environment. The HF stretching fequencies for X---HF bimolecules isolated in Ar, with X=Xe, N2, CO, and H2O are observed. Matrix isolated cyclic trimer and higher oligomers of HqFq are observed to have their HF stretching bands in the 3430 to 3175 cm−1 region. The discussion includes a vibrational predissociation lifetime correlation for the vapor phase dimer.