Anisotropic spectroscopy of nitrogen K-edge in group-III nitrides

Gao, Shang-Peng; Zhang, Aihua; Zhu, Jing; Yuan, Jun
April 2004
Applied Physics Letters;4/12/2004, Vol. 84 Issue 15, p2784
Academic Journal
Ab initio calculation of nitrogen K-edges for use in the core-level spectroscopy of industrially important group-III nitrides (AlN, GaN, InN) has been carried out systematically including the core-hole effect. The theoretical spectra for transition into final states with px,y and pz symmetries are in good agreement with the available anisotropic electron energy-loss measurements. Our spectra can be used as “fingerprints” to characterize the group-III nitrides, for example, not only to distinguish between different polymorphs of group-III nitrides, but also to identify the presence of surface oxidation. We have also presented our simulated results in terms of an orientation-average spectrum and a sample orientation-dependent dichroic spectrum for future reference. © 2004 American Institute of Physics.


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