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- W1991804447 abstract "We have used measurements of Raman scattering-excitation profile spectra for totally symmetric and non-totally symmetric vibration modes of free-base phthalocyanine molecules adsorbed on Ag, as a modulation spectroscopic probe, to obtain information about the energies, widths and vibronic character of the singlet (π to π*) valence electron excitations and about the character of the bonding of the adsorbate by the substrate. The data show that the Qx and Qy excitations are red-shifted relative to the corresponding excitations of isolated free-base phthalocyanine molecules, and broadened, and that the Qx - Qy energy separation is reduced by about a factor of two. On the other hand the frequencies of the various vibration modes are unshifted. We find that the resonant Raman scattering at the Qx and Qy excitations is due primarily to a Herzberg-Teller mechanism that involves vibronic coupling of the nearly degenerate Qx and Qy states with one another and with higher singlet states. These results together with the absence of any sizable xz, yz and zz components of the contribution to the Raman tensor from the Qx and Qy excitations suggest that the π electrons are not primarily involved in the bonding of the phthalocyanine to the Ag substrate. The decrease in the Qx - Qy separation is tentatively attributed to a weakening of the hydrogen bonds at the central nitrogen atoms that may result from the bonding of the molecules by the substrate via the lone pair electrons of the central nitrogens atoms." @default.
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- W1991804447 title "Raman Scattering-Excitation Profiles of Molecules Adsorbed on Metal Surfaces: Free-Base Phthalocyanine on Silver" @default.
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- W1991804447 doi "https://doi.org/10.1088/0031-8949/32/4/023" @default.
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