PIRSS and LEED investigations of HN3 adsorbed on NaCl(100)

Autor:	M. Hustedt, J. Oppermann, J. Heidberg, P. Paszkiewicz
Rok vydání:	1996
Předmět:	Inorganic chemistry Infrared spectroscopy Surfaces and Interfaces Activation energy Condensed Matter Physics Surfaces Coatings and Films chemistry.chemical_compound Crystallography Adsorption chemistry Desorption Materials Chemistry Hydrazoic acid Ammonium azide Spectroscopy Single crystal
Zdroj:	Surface Science. :447-450
ISSN:	0039-6028
DOI:	10.1016/0039-6028(95)01178-1
Popis:	Hydrazoic acid HN 3 molecularly adsorbed on NaCl(100) has been studied for the first time using polarization Fourier transform infrared surface spectroscopy (PIRSS) and LEED. The NaCl surface has been prepared by cleaving a single crystal in situ under UHV. Island growth up to a defined saturation coverage was observed. The strong polarization dependence of the sharp absorption multiplet of the asymmetric NNN stretching vibration (v 2 ) and the p(2 X 2) superstructure indicate a highly ordered adsorption phase. Isotopic mixture experiments reveal two groups of energetically equivalent HN 3 species within the adsorbate unit cell which contains four molecules. The orientation of both HN 3 species was determined and a zig-zag-chain-like arrangement of hydrogen bonded HN 3 dimers was inferred. The isosteric activation energy of desorption was estimated to be 43 ± 5 kJ mol -1 . The first results on the UV-induced surface reaction to ammonium azide NH 4 N 3 are reported.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f3b60c9072d3dbe4933cd4985fb4a7e0 https://doi.org/10.1016/0039-6028(95)01178-1 Zobrazit plný text záznamu Full Text from ScienceDirect