Plasmon Satellite in Soft X-Ray K Emission Band of Graphite

Abstract

The satellite emission bands were found on both sides of the K emission band of graphite. Peak positions of these satellite bands are 247 eV and 316 eV, and the intensities are estimated as about 1% and 0.8% to that of the main K band, respectively. As usual, the high-energy satellite may be caused by double ionization of K level. The energy distance, 29.8 eV, from the main band to the low-energy satellite corresponds reasonably to the plasmon energy, 25 eV, for σ-electrons of graphite and the satellite might be attributed to a plasmon satellite, which has been believed to occur only in metals so far.