X-RAY-ABSORPTION NEAR-EDGE STRUCTURE (XANES) OF IODINE-INTERCALATED C-60 - EVIDENCE OF I-2(DELTA+) IN I2C60

To solve the much-argued problem of the charge transfer effect upon in tercalation of iodine into C-60, we have analyzed the I L(I)-edge XANE S spectrum of the iodine intercalated C-60 based on the energy shift i n the multiple scattering region, the variation in Delta E (energy dif ference between the absorption edge and continuum) and the calculation of the WL area, together with that of I-2 and IBi2Sr2CaCu2Oy for comp arison. The dependence of the edge energy in the multiple scattering r egion on the bond distance is also examined. From the detailed analysi s and careful calculation, we have found that the iodine upon intercal ation into C-60 acts as an electron donor but that a very small degree of charge transfer between the host and guest takes place.