Articles you may be interested in 2-methyl furan: An experimental study of the excited electronic levels by electron energy loss spectroscopy, vacuum ultraviolet photoabsorption, and photoelectron spectroscopy

Evaporated films of zinc 5,10,15,20-tetraphenylporphyrin (ZnTPP) and 5,10,15,20-tetraphenylporphyrin (H2-TPP) on Ag substrates were studied by polarized X-ray absorption near-edge structure (XANES) spectroscopy. With the aid of theoretical simulation by CNDO/S2 calculations with the equivalent core approximation for model compounds, features in the N K-edge XANES spectra were assigned, and the feasibility of probing the N n* partial density of unoccupied states (PDOUS) by the N K-edge XANES was examined. The analysis of polarization dependence of XANES spectra revealed that ZnTPP molecules in the film deposited on Ag substrate at 367 K have a high degree of orientation with the central macrocyclic plane inclined by 28" f 10"to the substrate surface. On the other hand, ZnTPP films evaporated on room-temperature substrates and H2TPP films showed little indication of regular orientation.

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