Lateral Interaction in Ordered Hydrocarbon Overlayers: C-H Band Dispersion of Adsorbed Benzene

Graen, H.H.; Neuber, M.; Neumann, M.; Odörfer, G.; Freund, H.‐J.

doi:10.1209/0295-5075/12/2/014

Cited by 23 publications

(2 citation statements)

References 9 publications

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“…Two-dimensional band structures of the 2alo level have also been observed for densely packed, well-ordered benzene layers on hexagonaUy close-packed transitionmetal surfaces by us [20,34] and by other groups [51], but could not be unequivocally followed to large kll values due to the existence of non-equivalent domains (see above). For the saturated (~ x ~)R19.1 ° benzene layer on Ni(111), the 2alo level shows a dispersion of 0.45 eV [20,34]; a similar result has very recently also been reported for benzene on Os (001) [51].…”

Section: (4 X 2) Benzene/ni(llo)mentioning

confidence: 95%

Angle-resolved UV photoelectron spectroscopy of ethylene and benzene on nickel

Steinrück

1994

Appl. Phys. A

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Abstract.A review of results obtained by Angle-Resolved UV-Photoelectron Spectroscopy (ARUPS) using linearly polarized synchrotron radiation is presented for two model systems, ethylene/Ni and benzene/Ni. It is shown that for these systems detailed conclusions concerning adsorbate/substrate and adsorbate/adsorbate interactions can be derived from ARUPS spectra using symmetry selection rules, and in combination with model calculations. In particular, electronic structure, bonding, orientation and symmetry of the adsorbates in dilute and saturated layers will be discussed. It is shown that at high adsorbate coverages lateral interactions in the adsorbate layer play a dominant role. Steric effects in densely packed layers can lead to a reorientation of the molecules as compared to the orientation of the single molecules. The ARUPS spectra of well ordered, densely packed layers exhibit significant (up to 2 eV) dispersion of the various adsorbate bands and allow detailed conclusions on two-dimensional adsorbate band structures. 68.35.Bs, 73.20.At, 82.65.My Angle-Resolved UV Photoelectron Spectroscopy (AR-UPS) has proven to be a very important technique to study the electronic properties of surfaces and adsorbate systems [1][2][3][4][5][6][7][8][9][10]. It allows the investigation of the electronic structure in the outer valence region of adsorbate and substrate and focuses on the modifications induced in both by the bonding to the surface. From the changes in the energetic position of the various valence levels with respect to the free atom or molecule, direct conclusions on the electronic structure of the adsorbed particles and the nature of the bond to the substrate can be derived. Since the electronic valence structure is a more or less unique fingerprint of a particular adsorbate species, one should, at least in principle, be able to identify the chemical identity of an adsorbed species, i.e., to decide whether * New address where all correspondence should be addressed to: Experimentelle Physik II, Universit/it Wfirzburg, Am Hubland, D-97074 Wfirzburg, Germany a molecule adsorbs molecularly or whether dissociation occurs. For adsorbed molecules, the detailed analysis of the angle and polarization dependences of the emission from the various valence levels facilitates the correct assignment of the different peaks in the experimental spectra to the corresponding molecular levels, and by applying simple symmetry selection rules, the orientation and symmetry of the adsorbate can be determined [5][6][7][8][9][10][11][12]. Furthermore, ARUPS is the only method to study the formation of adsorbate band structures [5][6][7][8][9][10]. A factor that was very important for ARUPS to become such a powerful tool, is the nowadays easy access to synchrotron radiation with well-defined polarization, high intensity and tunable wavelength. These properties of the incident radiation allow polarization-dependent measurements with very good statistics at short measuring times. For our studies, the situation was further improved by ...

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Section: (4 X 2) Benzene/ni(llo)mentioning

confidence: 95%

Angle-resolved UV photoelectron spectroscopy of ethylene and benzene on nickel

Steinrück

1994

Appl. Phys. A

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“…Figure 5 shows a sketch of a possible structure model in which rather equilized sites near a bridge site are occupied. When the molecule at the cell edge is placed on top of a substrate atom, the remaining two molecules occupy both Work function decrease vs adsorbate density benzene on transition mete's Figure 6. Survey on the work function decrease vs benzene densities.…”

Section: Methodsmentioning

confidence: 99%

A Dense and CO Free Benzene Structure on Rh(111)

Neuber¹,

Schneider²,

Zubraegel³

et al. 1995

J. Phys. Chem.

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The adsorption of benzene on Rh(lll) was investigated by using low-energy electron diffraction (LEED), thermal desorption spectroscopy (TDS), and angle-resolved ultraviolet photoelectron spectroscopy (ARUPS).Under very good vacuum conditions we found a (\/l9 x \/l9)R23.4°pure benzene adsorption structure which could be converted to the c(2- = -1.47 eV, indicating one of the highest benzene densities on Rh(l 11) observed so far. A considerable dispersion of the 2aig-derived band of the adsorbate layer was observed.

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Fundamental Interface Properties in OFETs: Bonding, Structure and Function of Molecular Adsorbate Layers on Solid Surfaces

Soubatch

Temirov

Tautz

Organic Electronics

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Lateral Interaction in Ordered Hydrocarbon Overlayers: C-H Band Dispersion of Adsorbed Benzene

Cited by 23 publications

References 9 publications

Angle-resolved UV photoelectron spectroscopy of ethylene and benzene on nickel

Angle-resolved UV photoelectron spectroscopy of ethylene and benzene on nickel

A Dense and CO Free Benzene Structure on Rh(111)

Fundamental Interface Properties in OFETs: Bonding, Structure and Function of Molecular Adsorbate Layers on Solid Surfaces

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