Entropic stabilization of large adsorbates on weakly binding substrates-a thermal desorption and scanning tunneling microscopy study.

Thermal desorption (TD) of oligopyridine from HOPG shifts from approximately 700 to approximately 500 K when going from (sub-)mono- to multilayers. Stabilization of low coverages results from a continuous shift of the frequency factor nu, from 10(15) s(-1) for submonolayers to 10(24) s(-1) for multilayers, whereas the desorption barrier is virtually… CONTINUE READING