ELECTRONIC-STRUCTURE OF A LIB3O5 NONLINEAR-OPTICAL CRYSTAL

The electronic bands of a LiB3O5 (LBO) crystal with excellent nonlinea r optical properties have been studied using the scattered-wave method in embedded-cluster model. Calculations were carried out for a [B3O7] (5-) cluster, as this anionic group is the crystal basic structural un it. The interpretation of experimental photoemission spectra is based on electronic structure cluster calculations. From calculation perform ed, it follows that the contribution of trigonal and tetrahedral boron -oxygen groups dominates in the electronic structure of LBO, the contr ibution of 2p-boron stares is immaterial.