Photodesorption of NO from graphite(0001) surface mediated by silver clusters

Wettergren, Kristina; Kasemo, Bengt Herbert; Chakarov, Dinko

doi:10.1016/j.susc.2005.06.066

Cited by 17 publications

(14 citation statements)

References 13 publications

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“…The increase of the line-width of the 2D plasmon in (1 1 1) interface as a function of q || (Fig. 15) indicates the occurrence of an efficient decay channel into e-h pairs [82,[252][253][254][255][256]. (1 1 1) [257] and the formation of Ag micro-grains cause changes in the dispersion curve of the 2D plasmon (Fig.…”

Section: Collective Electronic Excitations In Thinmentioning

confidence: 99%

The influence of electron confinement, quantum size effects, and film morphology on the dispersion and the damping of plasmonic modes in Ag and Au thin films

Politano

Chiarello

2015

Progress in Surface Science

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Section: Collective Electronic Excitations In Thinmentioning

confidence: 99%

The influence of electron confinement, quantum size effects, and film morphology on the dispersion and the damping of plasmonic modes in Ag and Au thin films

Politano

Chiarello

2015

Progress in Surface Science

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“…[7][8][9] Nevertheless, the number of experimental investigations that address the effects of size and/or plasmon excitation on the photochemistry of adsorbates on MNP surfaces is very limited. 12,13,16 Apart from the plasmon excitation, confinement of the electronic excitations within the nanometersized MNPs can be important, for instance, via influencing the number and/or evolution of photoproduced hot electrons, [17][18][19][20] which may correspondingly change the efficiency of photoinduced processes and lead to size dependences. 9, 12, and 13) or composite materials composed of MNPs (Ref.…”

Section: Introductionmentioning

confidence: 99%

State-resolved investigation of the photodesorption dynamics of NO from (NO)2 on Ag nanoparticles of various sizes in comparison with Ag(111)

Mulugeta¹,

Watanabe²,

Menzel³

et al. 2011

The Journal of Chemical Physics

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The translational and internal state energy distributions of NO desorbed by laser light (2.3, 3.5, and 4.7 eV) from adsorbed (NO)(2) on Ag nanoparticles (NPs) (mean diameters, D = 4, 8, and 11 nm) have been investigated by the (1 + 1) resonance enhanced multiphoton ionization technique. For comparison, the same experiments have also been carried out on Ag(111). Detected NO molecules are hyperthermally fast and both rotationally and vibrationally hot, with temperatures well above the sample temperature. The translational and rotational excitations are positively correlated, while the vibrational excitation is decoupled from the other two degrees of freedom. Most of the energy content of the desorbing NO is contained in its translation. The translational and internal energy distributions of NO molecules photodesorbed by 2.3, 3.5, and in part also 4.7 eV light are approximately constant as a function of Ag NPs sizes, and they are the same on Ag(111). This suggests that for these excitations a common mechanism is operative on the bulk single crystal and on NPs, independent of the size regime. Notably, despite the strongly enhanced cross section seen on NP at 3.5 eV excitation energy in p-polarization, i.e., in resonance with the plasmon excitation, the mechanism is also unchanged. At 4.7 eV and for small particles, however, an additional desorption channel is observed which results in desorbates with higher energies in all degrees of freedom. The results are well compatible with our earlier measurements of size-dependent translational energy distributions. We suggest that the broadly constant mechanism over most of the investigated range runs via a transient negative ion state, while at high excitation energy and for small particles the transient state is suggested to be a positive ion.

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“…The confinement of electronic excitations in them may already lead to enhanced photoreactions [8]. On alkali and coinage metal NPs, photochemical yields can be strongly increased in the range of plasmon excitations due to field enhancement as in surface enhanced Raman spectroscopy [9,10]: plasmon field enhancement of photoinduced desorption (PID) of NO from roughened [11] and particulate Ag surfaces [12] have been reported. On the other hand, we recently reported direct influences of plasmon excitation for PID of Xe on Ag NPs leading to chaotic behavior explained in terms of hot spots by plasmonic coupling, and a new desorption mechanism [13].…”

mentioning

confidence: 99%

Size Effects in Thermal and Photochemistry of(NO)2on Ag Nanoparticles

et al. 2008

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NO dimers adsorbed on alumina supported silver nanoparticles (Ag NPs, radii R approximately 1-6 nm) show decreasing desorption temperatures and complex behavior of photoinduced desorption with decreasing NP size. In particular, for resonant excitation of the (1,0) Mie plasmon at 3.5 eV the photoinduced desorption cross section increases with 1/R, showing a pronounced enhancement (40 times) at R approximately 2.5 nm compared to Ag(111). At 4.7 eV the translational temperature of photodesorbed NO increases strongly with 1/R. We discuss these trends and peculiarities in terms of the size-dependent properties of the Ag NPs.

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Photodesorption of NO from graphite(0001) surface mediated by silver clusters

Cited by 17 publications

References 13 publications

The influence of electron confinement, quantum size effects, and film morphology on the dispersion and the damping of plasmonic modes in Ag and Au thin films

The influence of electron confinement, quantum size effects, and film morphology on the dispersion and the damping of plasmonic modes in Ag and Au thin films

State-resolved investigation of the photodesorption dynamics of NO from (NO)2 on Ag nanoparticles of various sizes in comparison with Ag(111)

Size Effects in Thermal and Photochemistry of(NO)2on Ag Nanoparticles

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