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Issue 4, 2010
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Entropic stabilization of large adsorbates on weakly binding substrates—a thermal desorption and scanning tunneling microscopy study

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Abstract

Thermal desorption (TD) of oligopyridine from HOPG shifts from ∼700 to ∼500 K when going from (sub-)mono- to multilayers. Stabilization of low coverages results from a continuous shift of the frequency factor ν, from 1015 s−1 for submonolayers to 1024 s−1 for multilayers, whereas the desorption barrier is virtually constant. Applying transition state theory (TST), we can explain this by a change from rotationally/translationally mobile, flat-lying molecules (submonolayers) to immobile, upright molecules (multilayers). At room temperature, (time resolved) scanning tunneling microscopy (STM) gives evidence for the existence and the stability of the mobile phase.

Graphical abstract: Entropic stabilization of large adsorbates on weakly binding substrates—a thermal desorption and scanning tunneling microscopy study

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Publication details

The article was received on 01 Oct 2009, accepted on 04 Nov 2009 and first published on 25 Nov 2009


Article type: Communication
DOI: 10.1039/B920481D
Citation: Phys. Chem. Chem. Phys., 2010,12, 818-822
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    Entropic stabilization of large adsorbates on weakly binding substrates—a thermal desorption and scanning tunneling microscopy study

    M. Roos, A. Breitruck, H. E. Hoster and R. J. Behm, Phys. Chem. Chem. Phys., 2010, 12, 818
    DOI: 10.1039/B920481D

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