The Low Frequency Region of the Infrared Spectrum of Matrix Isolated Vapors from LI20(S)+

摘要

The infrared spectrum of matrix isolated vapors from solid Li20 has been investigated on the region 60 - 350/cm. At 1640K, where the polyatomic species Li20(g) predominates, a single feature is found at 118/cm for Li2(7)0(g) and 112/cm for Li2(6)0(g). This is assigned to the bending mode nu sub 2. At higher temperatures, 1740K, where the concentration of Li202(g) becomes significant, two additional bands are found. On the basis of Li(6)-Li(7) isotopic shifts and relative intensities, it is possible to identify the bands in the region 240-260/cm with the B sub lu out of plane mode of Li202(g) and those at 231-243/cm to nu sub 2 of a new molecular species Li02(g). A force constant analysis is given. On the basis of the present work it has been concluded that Li20 is most probably linear and Li02 symmetric and nearly linear. (Author)