Two-photon photoemission from benzene adsorbed on Cu(111)

Munakata, Toshiaki; Sakashita, Tatsuo; Shudo, K.

doi:10.1016/s0368-2048(97)00123-0

Cited by 23 publications

(22 citation statements)

References 9 publications

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“…Since the spectrum of the bare Au(111) surface did not show these features, these peaks were attributed to the electronic structures of CoPc on the Au(111) surface. Figure 3(b) shows the dI=dV spectra of a single CoPc molecule on the Cu(100) surface in the bias range between À1:0 V and þ1:0 V. The spectra were measured at two different points indicated as (3) and (4). The spectra in Fig.…”

Section: Resultsmentioning

confidence: 99%

Scanning Tunneling Microscopy and Spectroscopy of Phthalocyanine Molecules on Metal Surfaces

Takada

Tada

2005

Jpn. J. Appl. Phys.

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We studied the electronic structure of cobalt-phthalocyanine (CoPc) molecules on Au(111) and Cu(100) surfaces by scanning tunneling microscopy and spectroscopy at 5 K. In the differential conductance (dI=dV) spectra, there were some peaks related to the highest occupied molecular orbital (HOMO), the lowest unoccupied MO (LUMO) and the d-orbitals of the Co atom. CoPc molecules on the Cu(100) surface had new electronic states between the peaks related to HOMO and LUMO, while those on the Au(111) surface did not show additional peaks. A dI=dV image indicated that the new states were generated by the hybridization between the LUMO of molecules and the electronic states of the Cu(100) surface.

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Section: Resultsmentioning

confidence: 99%

Scanning Tunneling Microscopy and Spectroscopy of Phthalocyanine Molecules on Metal Surfaces

Takada

Tada

2005

Jpn. J. Appl. Phys.

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“…The hollow adsorption site and the planar configuration of the molecule ͑with the canting of the H atoms͒ is generally found in experimental studies of benzene adsorption on metal surfaces. [9][10][11][12][13][14] This geometric configuration is characteristic of bonding via the -* complex of molecular orbitals.…”

Section: Discussionmentioning

confidence: 99%

“…Theoretical studies of benzene on copper ͑110͒ and ͑111͒ surfaces [6][7][8] have been complementing experimental studies of these two surfaces. [9][10][11][12][13][14] Less work has been done on the ͑100͒ surface. 7 On the ͑111͒ and ͑100͒ surfaces it is generally concluded that benzene adsorbs with the aromatic ring parallel to the surface.…”

Section: Introductionmentioning

confidence: 99%

Chemisorption of benzene and STM dehydrogenation products on Cu(100)

et al. 2003

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Modification of individual chemisorbed benzene molecules on Cu͑100͒ has recently been performed in atomic manipulation experiments ͓J. Phys. Chem. A. 104, 2463 ͑2000͒; Surf. Sci 451, 219 ͑2000͔͒. Benzene dissociates under controlled voltage pulses in a scanning tunneling microscope ͑STM͒ junction. The reaction is characterized as a dehydrogenation process and the fragments are identified as benzyne, C 6 H 4 . Here we present a density functional theory investigation of the chemisorption of benzene on the Cu͑100͒ surface, the nature of the bonding and its effect on the STM images. The fragments phenyl and benzyne formed after one-fold and two-fold dehydrogenation of chemisorbed benzene are studied in the same manner. The stability of the fragments is explored via their chemisorption energy, their electronic structure on the surface and their affinity for hydrogen. Benzyne fragments seem to be the most stable, in agreement with the conclusion of the aforementioned STM experiments.

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“…The new adsorption-induced peak has been assigned to the bonding state formed by hybridization between benzene * ͑e 2u , the lowest unoccupied orbital͒ and the copper orbitals. 2 The bonding state feature observed in 2PPE is enhanced by resonance with the first image potential state. 5 The state is rather similar to that observed with x-ray emission spectroscopy for benzeneadsorbed Cu͑110͒.…”

Section: ͓S0021-9606͑99͒70105-4͔mentioning

confidence: 99%