Stabilized hydrogen on Cs-modified Al(111): Evidence for formation of alkali aluminum dihydride surface complex

H. Kondoh, H. Nozoye

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The adsorption of hydrogen on Cs-modified Al(111) surfaces has been studied using high-resolution electron energy loss spectroscopy (HREELS) and temperature programmed desorption (TPD). A stabilized hydrogen species which desorbs simultaneously with Cs at 480 K (γ hydrogen) appears in the presence of Cs and the ratio between the number of Cs and that of the γ hydrogen is 1:2, independent of Cs coverage, which is indicative of a substantial attractive interaction between Cs and the γ hydrogen. HREEL spectra of the γ hydrogen exhibit intense loss peaks at around 800 and 1700 cm-1. Detailed analyses of these loss peaks using isotope mixtures (H+D) indicate that the γ hydrogen is directly bound to Al with a geminal structure (AlH2). From the combined results of TPD and HREELS, it is considered that a cesium aluminum dihydride complex (CsAlH 2) is formed on the surface, which is supported by ab initio calculations.

Original languageEnglish
Pages (from-to)8087-8093
Number of pages7
JournalThe Journal of Chemical Physics
Volume101
Issue number9
DOIs
Publication statusPublished - 1994 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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