The infrared matrix isolation spectrum and normal coordinate analysis of the Beryllium Fluoride Dimer

The infrared spectra of the beryllium fluoride vapor species isolated in matrices of neon and argon were obtained in the range (2000–190) cm^?1. Four frequencies were identified as belonging to the dimer Be₂F₄. Assuming the latter to have a planarbridge structure of D_2h symmetry, the frequencies in a neon matrix were tentatively assigned. A normal coordinate analysis of the dimer molecule is presented together with the calculated vibrational frequencies and the calculated mean amplitudes of vibration.