PROGRESS IN UNDERSTANDING VUV PHOTOEMISSION IN LOW-DIMENSIONALITY SYSTEMS

High-resolution angle-resolved photoemission and core-level photoemiss ion measurements were performed on single crystal samples of the quasi -one-dimensional material (TaSe4)(2)I and the cuprate superconductor B i2Sr2CaCu2O8+x. Resistivity measurements were performed on both materi als. X-ray diffraction, transmission electron microscopy (TEM), and AC susceptibility measurements were performed on the cuprate samples. Th e data indicate that photoemission studies provide key information in understanding the physics issues of both materials.