Adsorption of K on NbC(100): photoemission and thermal desorption study

Autor:	Shigeki Otani, S. Tokumitsu, Eizo Miyazaki, Shin-ichiro Tanaka, Toshihisa Anazawa, Rika Sekine, Kazuyuki Edamoto, Kenichi Ozawa
Rok vydání:	1995
Předmět:	Valence (chemistry) Photoemission spectroscopy Thermal desorption spectroscopy Chemistry Analytical chemistry Thermal desorption Surfaces and Interfaces Electronic structure Condensed Matter Physics Surfaces Coatings and Films Adsorption Desorption Materials Chemistry Work function
Zdroj:	Surface Science. 336:93-100
ISSN:	0039-6028
DOI:	10.1016/0039-6028(95)00424-6
Popis:	The adsorption state of K on NbC(100) has been studied with core-level photoemission spectroscopy (CLPES) and thermal desorption spectroscopy (TDS). The adsorption mechanism of K on the NbC(100) surface is found to be very unique as compared with those of many alkali-metal surface systems. The TDS study shows that the desorption energy of K increases with the increase of K coverage ( θ K ). The work function measurements show that the polarization of the NbC(100) surface after K adsorption is small as compared with those for many alkali-metal surface systems. The lineshape analysis of the K 3p photoemission spectra shows that the valence electronic density of states for adsorbed K is nearly independent on the coverage. Considering these results, it is proposed that the K-adsorbed layer is grown via the island formation mechanism.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6e39fadbff66a518c7ec16acb38be07b https://doi.org/10.1016/0039-6028(95)00424-6 Zobrazit plný text záznamu Full Text from ScienceDirect