Decomposition of P(CH3)3 on Ru(0001): comparison with PH3 and PCl3
| Autor: | H.-S. Tao, Theodore E. Madey, Ulrike Diebold, Neal D. Shinn |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Phosphide
Analytical chemistry chemistry.chemical_element Surfaces and Interfaces Condensed Matter Physics Bond order Decomposition Surfaces Coatings and Films Ruthenium chemistry.chemical_compound chemistry Chemisorption Materials Chemistry Physical chemistry Isostructural Chemical decomposition Morse potential |
| Zdroj: | Surface Science. 375:257-267 |
| ISSN: | 0039-6028 |
| Popis: | The decomposition of P(CH3)3 adsorbed on Ru(0001) at 80 K is studied by soft X-ray photoelectron spectroscopy using synchrotron radiation. Using the chemical shifts in the P 2p core levels, we are able to identify various phosphorus-containing surface reaction products and follow their reactions on Ru(0001). It is found that P(CH3)3 undergoes a step-wise demethylation on Ru(0001), P(CH3)3 → P(CH3)2 → P(CH3) → P, which is complete around ∼450 K. These results are compared with the decomposition of isostructural PH3 and PCl3 on Ru(0001). The decomposition of PH3 involves a stable intermediate, labeled as PHx, and follows a reaction of: PH3 → PHx → P, which is complete around ∼190 K. The conversion of chemisorbed phosphorus to ruthenium phosphide is observed and is complete around ∼700 K on Ru(0001). PCl3 also follows a step-wise decomposition reaction, PCl3 → PCl2 → PCl → P, which is complete around ∼300 K. The energetics of the adsorption and the step-wise decomposition reactions of PH3, PCl3 and P(CH3)3 are estimated using the bond order conservation Morse potential (BOCMP) method. The energetics calculated using the BOCMP method agree qualitatively with the experimental data. |
| Databáze: | OpenAIRE |
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