Surface photochemistry

Ho, W.

doi:10.1016/0039-6028(94)90712-9

Cited by 60 publications

(36 citation statements)

References 76 publications

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“…10 Several experimental groups have been energetically investigating the mechanism governing the photodesorption of small molecules from metal surfaces. 6,[11][12][13][14] A representative example is the uv-laser photodesorption study of NO from Pt͑111͒ performed by the NIST group. 11,13 Their results showed that desorption was due to a nonthermal mechanism-the mean kinetic energy of the desorbate corresponded to a temperature approximately four times that of the surface temperature.…”

Section: Introductionmentioning

confidence: 99%

Hot electron mediated photodesorption: A time-dependent approach applied to NO/Pt(111)

Harris¹,

Holloway²,

Darling³

1995

The Journal of Chemical Physics

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Section: Introductionmentioning

confidence: 99%

Hot electron mediated photodesorption: A time-dependent approach applied to NO/Pt(111)

Harris¹,

Holloway²,

Darling³

1995

The Journal of Chemical Physics

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“…[1][2][3][4][5]15 In our previous study of OCS on Ag͑111͒ it was suggested that the dissociative electron attachment level of the adsorbate was related to the dissociative attachment level of OCS measured in the gas phase, 24 stabilized by the image potential. [1][2][3][4][5]15 In our previous study of OCS on Ag͑111͒ it was suggested that the dissociative electron attachment level of the adsorbate was related to the dissociative attachment level of OCS measured in the gas phase, 24 stabilized by the image potential.…”

Section: Fig 2 ͑A͒mentioning

confidence: 99%

Surface plasmon enhanced substrate mediated photochemistry on roughened silver

Kidd

Lennon

Meech

2000

The Journal of Chemical Physics

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The wavelength dependent photochemical cross sections for three adsorbates ͑OCS, NO, SO 2 ͒ on roughened silver have been measured, and contrasted with the behavior on Ag͑111͒. Surface roughness leads to significant enhancements of the photochemical cross sections for all three adsorbates. The enhancement exhibits a maximum at 350Ϯ5 nm. Competing enhancement mechanisms are considered. Temperature programmed desorption measurements show that new adsorption sites are available on the surface, but that these are not uniquely associated with the enhanced cross section. The coincidence of the peak enhancement for both photodissociation of OCS and photodesorption of NO and SO 2 suggests a substrate mediated mechanism. It is proposed that the enhancement arises from surface plasmon excitation on the roughened surface. This mechanism may contribute to an enhanced cross section in two ways. First the collective surface plasmon excitation can decay to single particle, hot electron, excitations. The hot electrons so generated may attach to the adsorbates, to cause the photochemistry observed. Secondly, the enhanced local electric field at the surface can generate electron-hole pair excitations, which may also attach to the adsorbate.

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“…Photon-induced chemical reactions including the desorption of small molecules such as NO, CO, or O2 from solid surfaces have been a thriving area of research. 1,2,3,4,5,6,7 The aim of such investigations is typically to unravel and understand the basic processes that control the elementary steps, i.e. the mechanism and dynamics of adsorbate-substrate interactions during the desorption process.…”

Section: Introductionmentioning

confidence: 99%

Translational and Rotational Energy Distributions of NO Photodesorbed from Au(100)

Abujarada¹,

Flathmann

Koehler

2017

J. Phys. Chem. C

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We report velocity and internal state distributions of nitric oxide photodesorbed from an Au(100) single crystal using 355 nm and 266 nm photons. The velocity distributions were measured in all three dimensions independently using our novel 3D-velocity map imaging setup. Combined with the internal energy distributions, we reveal two distinct desorption mechanisms for the photodesorption of NO from gold dependent on the photon wavelength. The 355 nm desorption is dominated by a non-thermal mechanism due to excitation of an electron from the gold substrate to the adsorbed NO; this leads to a super-thermal and noticeably narrow velocity distribution, and a rotational state distribution that positively correlates with the velocity distribution and can be described by a rotational temperature appreciably above the surface temperature. Desorption with 266 nm photons leads to a slower average speed and wider angular distribution, and rotational temperatures not too far off the surface temperature. We conclude that in the absence of occupied orbitals in the substrate and unoccupied orbitals on the adsorbed NO separated by 4.7 eV, corresponding to 266 nm, the shorter wavelength desorption is dominated by a thermally-activated mechanism.

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Surface photochemistry

Cited by 60 publications

References 76 publications

Hot electron mediated photodesorption: A time-dependent approach applied to NO/Pt(111)

Hot electron mediated photodesorption: A time-dependent approach applied to NO/Pt(111)

Surface plasmon enhanced substrate mediated photochemistry on roughened silver

Translational and Rotational Energy Distributions of NO Photodesorbed from Au(100)

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