中文摘要：

最新发现的 iron-chalcogenide 超导体 K x Fe2y Se2 从另外的基于铁的超导体展出不同电子结构。利用极化依赖者解决角度的光致核裂变光谱学，我们在 K x Fe2y Se2 超导体决定了乐队结构的轨道的人物。到大程度，我们发现 K x Fe2y Se2 超导体与另外的基于铁的超导体，但是与它的自己的特征分享类似的轨道的人物。例如，我们在 s 和 p 几何学在地区角落附近解决了二高度退化的电子柱体分别地，显示在他们之间的可以忽略的相互作用。而且与乐队计算结果相对照，在 Z 附近的小电子衣袋被发现主要 d Z 被在于轨道。坚定的轨道的人物将帮助为 K x Fe2y Se2 构造一个现实主义的模型。

英文摘要：

The newly discovered iron-chalcogenide superconductor KxFe2_ySe2 exhibits a distinct electronic structure from other iron-based su- perconductors. Exploiting polarization-dependent angle-resolved photoemission spectroscopy, we have determined the orbital char- acters of band structure in a KxFe2_ySe2 superconductor. To a large extent, we find that KxFe2_ySe2 superconductor shares similar orbital characters with other iron-based superconductors, but with its own characteristics. For example, we have resolved two highly degenerate electron cylinders around the zone corner in the s and p geometries, respectively, indicating negligible interactions be- tween them. Moreover, in contrast to the band calculation results, the small electron pocket around Z is found to be mainly consisted of the dz2 orbital. The determined orbital characters would help to construct a realistic model for KxFe2_ySe2.