Translational and internal energy distributions of CO photochemically desorbed from oxidized Ni(111)

Asscher, Micha; Zimmermann, Frank M.; Springsteen, L. L.; Houston, Paul L.; Ho, W.

doi:10.1063/1.462768

Cited by 43 publications

(13 citation statements)

References 38 publications

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“…For inelastic collisions, the altered velocity distributions have the form of a Maxwellian velocity distribution that includes a stream velocity. Internal energy distributions have been used by Asscher et al 24 to probe the equilibrium nature of the desorption mechanism. These distributions are especially important to understanding the desorption mechanism because translational energy distributions can be obscured by interferences from collisions and cooling resulting from interactions with the surface past the transition state, i.e., from an exit barrier.…”

Section: Laser-induced Thermal Desorptionmentioning

confidence: 99%

Evidence for thermalization of surface-desorbed molecules at heating rates of 108 K/s

Maechling

Clemett

Engelke

et al. 1996

The Journal of Chemical Physics

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Articles you may be interested inOn the mechanism of C60 thin film laserinduced desorption Discharge flowtube studies of O(3 P)+N2H4 reaction: The rate coefficient values over the temperature range 252-423 K and the OH(X 2Π) product yield at 298 K Resonant laser ionization of thorium using continuous thermal heating and pulsed laser evaporation AIP Conf.Laser desorption of aniline-d7 from a single-crystal surface ͑0001͒ of sapphire ͑Al 2 O 3 ͒ at a heating rate on the order of 10 8 K/s was studied using pulsed infrared laser radiation for desorption and resonance enhanced multiphoton ionization ͑REMPI͒ for detection of the desorbed aniline molecules. On the basis of single-vibronic-level fluorescence ͑SVLF͒ spectra we unambigiously assign the 10b transition. REMPI spectroscopy provides vibrational temperatures and therefore describes the internal energy distribution, whereas the time-of-flight ͑TOF͒ profiles provide translational temperatures. All results are consistent with a thermal mechanism for desorption, i.e., pulsed heating of the sapphire surface on the nanosecond time scale leads to thermal desorption and rapid thermalization of the escaping molecules.

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Section: Laser-induced Thermal Desorptionmentioning

confidence: 99%

Evidence for thermalization of surface-desorbed molecules at heating rates of 108 K/s

Maechling

Clemett

Engelke

et al. 1996

The Journal of Chemical Physics

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“…The final energy distribution of desorbed molecules, for example, only allows quite moderate conclusions on the progressing steps within the entire desorption mechanism. [3][4][5] A deeper insight requires a more direct access to the dynamical processes during the initiating steps. This would in a certain sense be the link between theoretical calculations and final-state investigations.…”

Section: Introductionmentioning

confidence: 99%

Decay dynamics of photoexcited alkali chemisorbates: Real-time investigations in the femtosecond regime

1999

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The inelastic decay time of photoexcited cesium and sodium adsorbed on different single-crystal surfaces has been investigated by means of time-resolved two-photon photoemission. Especially in the case of cesium, we observe a surprisingly high lifetime. For Cs/Cu͑111͒ we obtain a value of 15Ϯ6 fs. Intra-atomic hybridization, the specific band structure of the substrate, and adsorption site effects may be responsible for this behavior. These different mechanisms are discussed in detail. ͓S0163-1829͑99͒09231-0͔

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“…10 The phenomena observed for high photon fluxes are currently described by models such as desorption in-duced by multiple electronic transitions ͑DIMET͒ or electronic friction interaction with the adsorbate. 11 Recently, laser-induced desorption from semiconductor [12][13][14][15][16][17] and oxide surfaces [18][19][20][21][22][23] gained increasing attention. The obvious difference to metallic systems is the appearance of a substantial band gap between the filled valence band and the empty conduction band of insulators.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond ultraviolet laser-induced desorption of NO from NiO(100)/Ni(100)

Eichhorn

Richter

Al‐Shamery

et al. 1999

The Journal of Chemical Physics

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We have studied the ultraviolet laser-induced desorption of NO molecules from an epitaxial film of NiO(100) on Ni(100) for pulse durations of 550 fs and at a photon energy of 3.95 eV. For applied laser intensities up to 450 MW/cm2, the highest intensities employed in this work, a linear dependence of the desorption yield on the laser intensity is observed. A desorption cross section of (1.9±0.3)⋅10−17 cm2 is then derived. The molecules are detected with rovibrational state selectivity by (1+1)-REMPI via the A 2Σ+(v′=0,1,2,3)←X 2Π(v″=0,1,2,3) γ-band transitions. The rotational population distributions are nonthermal, with rotational temperatures of about 290 K at low and of about 770 K at high rotational energies. The relative populations in the 2Π1/2 and 2Π3/2 fine-structure states and of the Λ-doublet states are examined for the given set of (v″,J″) quantum numbers. The vibrational states v″>0 are significantly populated approaching vibrational temperatures of 3800 K. Velocity distributions of the desorbed molecules are measured for individual rovibrational states. Bimodal distributions with a distinct rotational-translational coupling are observed. Further, molecules desorbing in the excited fine-structure state 2Π3/2 show a higher velocity than those desorbing in 2Π1/2 The results are compared with earlier ones obtained for the same system with nanosecond desorption pulses at hν=6.4 eV.

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Translational and internal energy distributions of CO photochemically desorbed from oxidized Ni(111)

Abstract: The first translational, rotational and vibrational energy resolved study of CO desorption from epitaxically grown NiO(111) at 70 K in photochemistry study is reporeted. (AIP)

Cited by 43 publications

References 38 publications

Evidence for thermalization of surface-desorbed molecules at heating rates of 108 K/s

Evidence for thermalization of surface-desorbed molecules at heating rates of 108 K/s

Decay dynamics of photoexcited alkali chemisorbates: Real-time investigations in the femtosecond regime

Femtosecond ultraviolet laser-induced desorption of NO from NiO(100)/Ni(100)

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