The adsorption of benzene and naphthalene on the Rh(111) surface: A LEED, AES and TDS study
The adsorption of benzene and naphthalene on the Rh(111) single-crystal surface has been studied by low-energy electron diffraction (LEED), Auger electron spectroscopy (AES) and thermal desorption spectroscopy (TDS). Both benzene and naphthalene form two different ordered surface structures separate...
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Veröffentlicht in: | Surface science 1983-11, Vol.134 (1), p.161-183 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The adsorption of benzene and naphthalene on the Rh(111) single-crystal surface has been studied by low-energy electron diffraction (LEED), Auger electron spectroscopy (AES) and thermal desorption spectroscopy (TDS). Both benzene and naphthalene form two different ordered surface structures separated by temperature-induced phase transitions: benzene transforms from a (
3
1
1
3
) structure, which can also be labelled c(
2
3
× 4
)rect, to a (3 × 3) structure in the range of 363–395 K, while naphthalene transforms from a (
3
3
× 3
3
)R30° structure to a (3 × 3) structure in the range 398–423 K. Increasing the temperature further, these structures are found to disorder at about 393 K for benzene and about 448 K for naphthalene. Then, a first H
2 desorption peak appears at about 413 K for benzene and 578 K for naphthalene and is interpreted as due to the occurrence of molecular dissociation. All these phase transitions are irreversible. The ordered structures are interpreted as due to flat-lying or nearly flat-lying intact molecules on the rhodium surface, and they are compared with similar structures found on other metal surfaces. Structural models and phase transition mechanisms are proposed. |
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ISSN: | 0039-6028 1879-2758 |
DOI: | 10.1016/0039-6028(83)90318-7 |