Surface femtochemistry of 02 and CO on Pt(111)

Deliwala, Shrenik; Finlay, Richard; Goldman, Jay R.; Her, Tsing-Hua; Mieher, W. D.; Mazur, Eric

doi:10.1016/0009-2614(95)00791-2

Cited by 77 publications

(67 citation statements)

References 23 publications

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“…[28][29][30] The desorption yield is nonlinearly enhanced with increasing light fluence by a femtosecondpulsed laser. [31][32][33] However, no difference has been found in the dynamics of the resultant hot-atoms.…”

Section: Introductionmentioning

confidence: 99%

Hot-atom mechanism in photodesorption of molecular oxygen from a stepped platinum (113) surface

Sano

Ohno

Yamanaka

et al. 1998

The Journal of Chemical Physics

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The photodesorption of oxygen admolecules was studied on a stepped Pt(113)ϭ(s)2(111) ϫ(001) surface with 193 nm irradiation at 110 K. Multidirectional desorptions were found to collimate at Ϯ12-20°and Ϯ45-49°off the surface normal and also along the surface normal in a plane along the trough. The first component is always dominant, and the weak second component only appears at higher oxygen coverages. The normally directed desorption is not significant. The translational energy of desorbing O 2 peaks around 15-20°and 50°, confirming the inclined desorptions. It is proposed that these inclined components are due to the desorption induced by the impact of oxygen admolecules with hot oxygen atoms from the photodissociation of adsorbed molecular oxygen, emitted along the trough. A simple cosine distribution was found to fit the thermal desorption from oxygen admolecules and also the recombinative desorption of oxygen adatoms. The 193 nm irradiation also produces additional, less tightly bound oxygen adatoms, which yield a desorption component collimated at 15°from the surface normal in the step-down direction.

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Section: Introductionmentioning

confidence: 99%

Hot-atom mechanism in photodesorption of molecular oxygen from a stepped platinum (113) surface

Sano

Ohno

Yamanaka

et al. 1998

The Journal of Chemical Physics

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“…Indeed, the description of the interaction of nonequilibrium electrons with LUMO of adsorbates with the TTM draws outside the possible implication of nonthermal electrons in the process of inelastic electron tunnelling since the population of nonthermal electrons has disappeared when an electronic temperature is established. However, nonthermal electrons may also drive surface chemistry as proposed from the desorption yield dependence on excitation wavelength [25,26], from long-lived nonthermal electrons [17] or from the direct observation by transient absorption spectroscopy [19].…”

Section: Surface Femtochemistrymentioning

confidence: 99%

Size dependence investigations of hot electron cooling dynamics in metal/adsorbates nanoparticles

Bauer¹,

Abid²,

Girault³

2005

Chemical Physics

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The size dependence of electron-phonon coupling rate has been investigated by femtosecond transient absorption spectroscopy for gold nanoparticles (NPs) wrapped in a shell of sulfate with diameter varying from 1.7 to 9.2 nm. Broad-band spectroscopy gives an overview of the complex dynamics of nonequilibrium electrons and permits the choice of an appropriate probe wavelength for studying the electron-phonon coupling dynamics. Ultrafast experiments were performed in the weak perturbation regime (less than one photon in average per nanoparticle), which allows the direct extraction of the hot electron cooling rates in order to compare different NPs sizes under the same conditions. Spectroscopic data reveals a decrease of hot electron energy loss rates with metal/ adsorbates nanosystem sizes. Electron-phonon coupling time constants obtained for 9.2 nm NPs are similar to gold bulk materials ($1 ps) whereas an increase of hot electron cooling time up to 1.9 ps is observed for sizes of 1.7 nm. This is rationalized by the domination of surface effects over size (bulk) effects. The slow hot electron cooling is attributed to the adsorbates-induced long-lived nonthermal regime, which significantly reduces the electron-phonon coupling strength (average rate of phonon emission).

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“…11 An interesting observation in DIMET experiments is that the desorption yield typically increases with the absorbed fluence with a power scaling law. [12][13][14][15] The nonlinear behavior is attributed to the multiple electronic transitions.…”

Section: Introductionmentioning

confidence: 99%

Dissipative quantum dynamics in discrete energy representation: Photon-stimulated desorption of NO from metals

Guo

1999

The Journal of Chemical Physics

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Surface femtochemistry of 02 and CO on Pt(111)

Cited by 77 publications

References 23 publications

Hot-atom mechanism in photodesorption of molecular oxygen from a stepped platinum (113) surface

Hot-atom mechanism in photodesorption of molecular oxygen from a stepped platinum (113) surface

Size dependence investigations of hot electron cooling dynamics in metal/adsorbates nanoparticles

Dissipative quantum dynamics in discrete energy representation: Photon-stimulated desorption of NO from metals

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