Carbon monoxide adsorption and oxidation on monolayer films of cubic platinum nanoparticles investigated by infrared-visible sum frequency generation vibrational spectroscopy

Article Abstract:

The adsorption and oxidation of CO on monolayer films of cubic Pt nanoparticles synthesized by a modified solution-phase polyol process are investigated by sum frequency generation (SFG) vibrational spectroscopy in total internal reflection (TIR) geometry. The active energy of approximately 19.8 kcal/mol, determined from the SFG data is close to that obtained from gas chromatography (GC) measurements of CO oxidation rates at different temperatures.

Oxidation-reduction reaction, Oxidation-reduction reactions, Vibrational spectra

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Dynamic intensity borrowing in porphyrin J-aggregates revealed by sub-5-fs spectroscopy

Article Abstract:

The sub-5-fs real-time spectroscopy of porphyrin J-aggregates to study the exciton vibration coupling in the one-dimensional Frenkel exciton system is investigated. Results were explained by a new model modulated Q-band-transition dipole moment, originating from oscillator strength transfer from the intense B-band to the weak Q-band by dynamic intensity borrowing (DIB) mechanism through the vibronic interaction.

Exciton theory, Excitons

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In situ time-resolved second-harmonic generation form Pt(111) microfacetted single-crystal platinum microspheres

Article Abstract:

A study of in the situ time-resolved second-harmonic generation (SHG) measurements on Pt(111) microfacets formed spontaneously on the surface of single-crystal pt microspheres is presented. The results concluded that the potential region over which the SHG response is linear is much wider than found for other Pt low index facets, providing strong evidence that the Pt(111) facets are indeed well-defined.

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