Orientation and symmetry of ethylene on Pd(110): A combined HREELS and NEXAFS study

H. Okuyama; S. Ichihara; H. Ogasawara; Hiroyuki Kato; T. Komeda; Maki Kawai; J. Yoshinobu

doi:10.1063/1.481168

Orientation and symmetry of ethylene on Pd(110): A combined HREELS and NEXAFS study

H. Okuyama, S. Ichihara, H. Ogasawara, Hiroyuki Kato, T. Komeda, Maki Kawai, J. Yoshinobu

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Abstract

The orientation and symmetry of low-coverage ethylene adsorbed on Pd(110) at 150 K were studied by high-resolution electron energy-loss spectroscopy (HREELS) and near-edge x-ray absorption fine structure (NEXAFS) analysis. HREELS measurements unambiguously revealed that ethylene is π-bonded with the C-C axis preferentially aligned along the [110] row; this finding was also confirmed by NEXAFS. The molecular symmetry of this species was found to be C₁ and thus, we proposed that the C-C axis is tilted against the surface. The effect of coadsorption with hydrogen was examined, and a flat-lying species with C₂ symmetry was found to dominate on H-covered Pd(110). Furthermore, the coadsorbed hydrogen induced the C-C axis rotated about the surface normal, possibly reflecting the zigzag phase formation of adsorbed hydrogen atoms.

Original language	English
Pages (from-to)	5948-5956
Number of pages	9
Journal	Journal of Chemical Physics
Volume	112
Issue number	13
DOIs	https://doi.org/10.1063/1.481168
Publication status	Published - 2000 Apr 1
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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title = "Orientation and symmetry of ethylene on Pd(110): A combined HREELS and NEXAFS study",

abstract = "The orientation and symmetry of low-coverage ethylene adsorbed on Pd(110) at 150 K were studied by high-resolution electron energy-loss spectroscopy (HREELS) and near-edge x-ray absorption fine structure (NEXAFS) analysis. HREELS measurements unambiguously revealed that ethylene is π-bonded with the C-C axis preferentially aligned along the [110] row; this finding was also confirmed by NEXAFS. The molecular symmetry of this species was found to be C1 and thus, we proposed that the C-C axis is tilted against the surface. The effect of coadsorption with hydrogen was examined, and a flat-lying species with C2 symmetry was found to dominate on H-covered Pd(110). Furthermore, the coadsorbed hydrogen induced the C-C axis rotated about the surface normal, possibly reflecting the zigzag phase formation of adsorbed hydrogen atoms.",

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T1 - Orientation and symmetry of ethylene on Pd(110)

T2 - A combined HREELS and NEXAFS study

AU - Okuyama, H.

AU - Ichihara, S.

AU - Ogasawara, H.

AU - Kato, Hiroyuki

AU - Komeda, T.

AU - Kawai, Maki

AU - Yoshinobu, J.

PY - 2000/4/1

Y1 - 2000/4/1

N2 - The orientation and symmetry of low-coverage ethylene adsorbed on Pd(110) at 150 K were studied by high-resolution electron energy-loss spectroscopy (HREELS) and near-edge x-ray absorption fine structure (NEXAFS) analysis. HREELS measurements unambiguously revealed that ethylene is π-bonded with the C-C axis preferentially aligned along the [110] row; this finding was also confirmed by NEXAFS. The molecular symmetry of this species was found to be C1 and thus, we proposed that the C-C axis is tilted against the surface. The effect of coadsorption with hydrogen was examined, and a flat-lying species with C2 symmetry was found to dominate on H-covered Pd(110). Furthermore, the coadsorbed hydrogen induced the C-C axis rotated about the surface normal, possibly reflecting the zigzag phase formation of adsorbed hydrogen atoms.

AB - The orientation and symmetry of low-coverage ethylene adsorbed on Pd(110) at 150 K were studied by high-resolution electron energy-loss spectroscopy (HREELS) and near-edge x-ray absorption fine structure (NEXAFS) analysis. HREELS measurements unambiguously revealed that ethylene is π-bonded with the C-C axis preferentially aligned along the [110] row; this finding was also confirmed by NEXAFS. The molecular symmetry of this species was found to be C1 and thus, we proposed that the C-C axis is tilted against the surface. The effect of coadsorption with hydrogen was examined, and a flat-lying species with C2 symmetry was found to dominate on H-covered Pd(110). Furthermore, the coadsorbed hydrogen induced the C-C axis rotated about the surface normal, possibly reflecting the zigzag phase formation of adsorbed hydrogen atoms.

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Orientation and symmetry of ethylene on Pd(110): A combined HREELS and NEXAFS study

Abstract

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