The interaction of Ca evaporated in vacuum onto a 2H–NbSe2 surface held at room temperature was studied by photoelectron spectroscopy. Indications of an intercalation reaction were observed initially, but larger Ca depositions resulted in a layer-breaking reaction producing a disordered overlayer of varying compositions. The layer-breaking reaction is likely due to the intercalation compound becoming unstable as the local Ca concentration exceeds the threshold value. Continued Ca depositions eventually resulted in the growth of three-dimensional islands of Ca metal, exposing relatively unaffected NbSe2 layers between the Ca islands.

中文翻译：

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Ca 在 2H-NbSe2 表面上的沉积：竞争过程

通过光电子能谱研究了真空蒸发的 Ca 在室温下的 2H-NbSe2 表面上的相互作用。最初观察到插层反应的迹象，但较大的钙沉积导致破层反应，产生不同成分的无序覆盖层。破层反应可能是由于当局部 Ca 浓度超过阈值时插层化合物变得不稳定。持续的 Ca 沉积最终导致 Ca 金属三维岛的生长，暴露出 Ca 岛之间相对未受影响的 NbSe2 层。