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Toward photochemistry of integrated heterogeneous systems
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View: Figures


Image of FIG. 1.
FIG. 1.

Excitation mechanisms in photochemistry at metal surfaces: (a) Substrate-mediated indirect excitation and (b) adsorbate-localized direct excitation.

Image of FIG. 2.
FIG. 2.

Electronic states on an alkali-covered Cu(111) surface as a function of coverage. IPS: image potential state, AS: antibonding state, SS: Shockley surface state, QWS: quantum-well state, and OR: overlayer resonance. The shaded regions show the band structure of bulk copper projected onto the surface Brillouin zone. The energy structures are adapted from the experimental and theoretical works on Na (Refs. 9 and 10) and K.11 Because this figure is to provide the electronic structure qualitatively, the energies plotted here are not exact.

Image of FIG. 3.
FIG. 3.

(a) Excitation wavelength dependence of TRSHG traces taken from Cs/Cu(111) at λex = 800 nm (red open circles) and λex = 400 nm (blue open squares). The probe wavelength is 565 nm for both traces. The incident pump fluence was 8.0 mJ/cm2 and the Cs coverage was 0.23 ML at λex = 800 nm; 3.6 mJ/cm2; and 0.25 ML at λex = 400 nm. Solid lines are results of the nonlinear least-square fitting with Eq. (1). Dotted lines are overdamped components contributed by hot electrons. (Inset) Fourier power spectra of the oscillatory components of the TRSHG traces for λex = 800 nm (solid) and for λex = 400 nm (dotted). (b) Oscillating components obtained by subtracting the overdamped ones. Note that initial phases are very different to each other, while the frequencies are very similar. Reprinted with permission from K. Watanabe, Y. Matsumoto, T. Yasuike, and K. Nobusada, J. Phys. Chem. A 115, 9528 (2011). Copyright 2011 American Chemical Society.


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Scitation: Toward photochemistry of integrated heterogeneous systems