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Temperature-dependent interaction of C_(60) with Ge(1 1 1)-c(2 x 8)

机译:C_(60)与Ge(1 1 1)-c(2 x 8)的温度依赖性相互作用

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We report photoemission and low energy electron diffraction (LEED) data of a C_(60) multilayer adsorbed on Ge(1 1 1)-c(2 x 8) surface, as a function of annealing temperature. Remarkable changes take place in the valence band (VB) as the temperature is increased. Three phases are revealed, with different LEED patterns, coverages and molecular distance, including a 'bulk-like' C_(60) hexagonal single layer, not observed so far, the 3(3~(1/2)) x 3(3~(1/2)R30°and 13~(1/2) x 13~(1/2)R14°phases already known from literature. The ultra-violet VB spectra show strong similarities with C_(60) adsorbed on Si surfaces, with the splitting of the C_(60) highest occupied molecular orbital (HOMO) derived bands into two peaks, due to the C_(60) bonding with the substrate. The bond is activated by the temperature and implies molecular deformation. At ~700℃ the C_(60) features disappear and core level photoemission spectra indicate carbon desorption or interdiffusion into the substrate.
机译:我们报告吸附在Ge(1 1 1)-c(2 x 8)表面上的C_(60)多层膜的光发射和低能电子衍射(LEED)数据,该数据是退火温度的函数。随着温度的升高,价带(VB)发生显着变化。揭示出三个阶段,具有不同的LEED图案,覆盖范围和分子距离,包括一个“块状” C_(60)六角形单层,到目前为止尚未观察到,为3(3〜(1/2))x 3(3)文献中已经知道〜(1/2)R30°和13〜(1/2)x 13〜(1/2)R14°相,紫外VB光谱显示与吸附在Si表面的C_(60)有很强的相似性,由于C_(60)与底物的键合,使C_(60)最高占据分子轨道(HOMO)的能带分裂为两个峰,该键被温度激活并暗示分子变形,在〜700 ℃的C_(60)特征消失,核心能级光发射光谱表明碳解吸或相互扩散到基质中。

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