Preparation and infrared property of BeH₂ film

Transparent BeH2 films have been prepared with vaporized beryllium atoms reacting with active hydrogen atoms. Scanning electron microscopy photographs show that the surfaces of BeH2 films have microvoids, and the infrared spectrum reveals an intense absorption band at 722 cm-1. BeH2 reticular structures based on tetrahedron structure have been calculated by density functional theory method. The frequency and intensity of three vibration modes obtained from the calculations are in reasonably good agreement with those observed in references for BeH2 powders. The calculated frequency of Be－H－Be bond bending vibrations is 747 cm-1, which is consistent with the measured IR absorption band of BeH2 films in this paper. It can be speculated that the structures of BeH2 films