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Volumn 111, Issue 17, 2007, Pages 6149-6153

Highly efficient ultrafast energy transfer into molecules at surface step sites

Author keywords

[No Author keywords available]

Indexed keywords

ADSORBATES; DENSITY FUNCTIONAL THEORY; DESORPTION; ENERGY TRANSFER; FERMI LEVEL; FRICTION; NITROGEN OXIDES; ULTRAFAST PHENOMENA;

EID: 34249059129     PISSN: 19327447     EISSN: 19327455     Source Type: Journal    
DOI: 10.1021/jp070470g     Document Type: Article
Times cited : (17)

References (39)
  • 21
    • 34249035272 scopus 로고    scopus 로고
    • 4q (based on M. Wilde et al., Surf. Sci. 1999, 27, 427-428 and references therein) to estimate the yield at 0°.
    • 4q (based on M. Wilde et al., Surf. Sci. 1999, 27, 427-428 and references therein) to estimate the yield at 0°.
  • 22
    • 34249028763 scopus 로고    scopus 로고
    • The relative desorption probability for CO on steps obtained in this way constitutes a lower limit because laser-induced motion of CO molecules from step to terrace sites is known to occur.19 Hence, for the step-covered surface, there is a small additional contribution from CO molecules that have not diffused back to the steps, after being driven to terrace sites by the initial laser shot. Moreover, desorption of molecules from the step sites via the terrace sites directly after excitation could also play a role. From the different angle dependence of the desorption probability for step and terrace sites Figure 1, it can be concluded that this process alone can not explain the data, but it certainly can not be excluded
    • 19 Hence, for the step-covered surface, there is a small additional contribution from CO molecules that have not diffused back to the steps, after being driven to terrace sites by the initial laser shot. Moreover, desorption of molecules from the step sites via the terrace sites directly after excitation could also play a role. From the different angle dependence of the desorption probability for step and terrace sites (Figure 1), it can be concluded that this process alone can not explain the data, but it certainly can not be excluded.
  • 25
    • 34249028764 scopus 로고    scopus 로고
    • For the strong coupling observed here, the reaction rate follows the electronic transient temperature quite closely, resulting in a relative large error in the coupling time
    • For the strong coupling observed here, the reaction rate follows the electronic transient temperature quite closely, resulting in a relative large error in the coupling time.
  • 26
    • 34249063062 scopus 로고    scopus 로고
    • The extracted electron coupling times for NO are smaller than the inverse mode frequency of the low-frequency modes. This is unphysical because energy transfer into the low-frequency modes cannot occur faster than the motion associated with the modes. Although the absolute values for the friction coefficient obtained with this simple one-dimensional friction model may have limited meaning, the relative difference between the step and terrace coefficient clearly indicates a ∼3-fold stronger coupling of the laser-heated electrons to the adsorbate at the steps relative to the terraces
    • The extracted electron coupling times for NO are smaller than the inverse mode frequency of the low-frequency modes. This is unphysical because energy transfer into the low-frequency modes cannot occur faster than the motion associated with the modes. Although the absolute values for the friction coefficient obtained with this simple one-dimensional friction model may have limited meaning, the relative difference between the step and terrace coefficient clearly indicates a ∼3-fold stronger coupling of the laser-heated electrons to the adsorbate at the steps relative to the terraces.
  • 39
    • 34249030685 scopus 로고    scopus 로고
    • Although the adsorption structure is slightly different from dosing directly at 85 K,18 the first shot yield and depletion curve are indistinguishable
    • 18 the first shot yield and depletion curve are indistinguishable.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.