K W Hipps - Scanning Tunneling Microscopy, Orbital-Mediated Tunneling Spectroscopy, and Ultraviolet Photoelectron Spectroscopy of Nickel(II) Octaethylporphyrin Deposited from Vapor

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  Publication Details (including relevant citation   information):

  Scudiero, L., Barlow, Dan E., Hipps, K. W. The Journal of   Physical Chemistry B 2002 106 (5)   996-1003

  Abstract: Thin films of vapor-deposited Ni(II)   octaethylporphyrin (NiOEP) were studied supported on gold. Thin   films thermally deposited onto flame-annealed Au (111) were   analyzed by ultraviolet photoelectron spectroscopy (UPS) using He   I radiation and by X-ray photoelectron spectroscopy (XPS) using   Mg Kα radiation. Reflectance absorption infrared spectroscopy   (RAIRS) was used to study NiOEP films on polycrystalline gold.   Scanning tunneling microscopy (STM) and orbital-mediated   tunneling spectroscopy (STM-OMTS) were performed on submonolayer   films of NiOEP supported on Au(111). The highest occupied π   molecular orbitals of the porphyrin ring were seen in both   STM-OMTS and in UPS at about 6.4 and 6.8 eV below the vacuum   level. The lowest unoccupied π* molecular orbital of the   porphyrin ring also was observed by STM-OMTS to be located near   3.4 eV below the vacuum level.

  Address (URL): http://dx.doi.org/10.1021/jp012436m