The electronic band structure of the first-stage cesium-intercalated graphite C8Cs was determined by the highly-angle-resolved ultraviolet photoelectron spectroscopy. We found a prominent energy dispersion of the π∗ band at K point for the first time. The experimentally-estimated electron occupancy of the π∗ band is 0.45 ±0.05 unit electronic charge. This strongly suggests that another half of a unit electronic charge is accommodated in the interlayer band at the Γ point. The present experimental results have been compared with the theoretical band calculations presented so far as well as with the recently reported experimental results on Cs overlay er on graphite.
ASJC Scopus subject areas
- Physics and Astronomy(all)