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Interaction of Ethyl Chloride with Amorphous Solid Water Thin Film on Ru(001) and O/Ru(001) Surfaces
 

Summary: Interaction of Ethyl Chloride with Amorphous Solid Water Thin Film on Ru(001) and
O/Ru(001) Surfaces
Yousif Ayoub and Micha Asscher*
Institute of Chemistry and the Farkas Center for Light Induced Processes,
The Hebrew UniVersity of Jerusalem, Jerusalem 91904, Israel
ReceiVed: January 30, 2009; ReVised Manuscript ReceiVed: April 11, 2009
The adsorption of ethyl chloride (EC) on clean and oxygen covered Ru(001) surfaces and its interaction with
coadsorbed amorphous solid water (ASW) is reported based on temperature-programmed desorption (TPD)
and work function change (4) measurements. Adsorption of EC is characterized by a decrease of 2.1 eV
in work function at monolayer coverage. Flipped adsorption geometry on average (ethyl facing the surface)
is found in the second layer with a 0.3 eV increase in the work function. On ruthenium substrates the orientation
of EC molecules could be controlled chlorine down or up by varying the oxygen coverage, as indicated by
work function change measurements. P-TPD from clean Ru(001) surface reveals a complete dissociation of
the EC molecules on the clean Ru(001) surface at coverages up to 0.1 ( 0.05 ML. At higher coverage it
leads to two distinct TPD peaks: at T )175 and 120-130 K, for the monolayer and multilayer coverage,
respectively. Compression of preadsorbed 0.3 ML EC molecules into small islands on the surface occurs
when ASW layers at coverage in the range 0.5-6 bilayers (BL) are adsorbed on top of the EC covered
surface, associated with a shift in peak desorption from 190 K down to 125 K. A Caging process of EC
molecules within the layers of ASW takes place by adsorbing more than 6 BL until a fully caged system has
developed above 20 ASW BL. A reversed TPD peak shift of the trapped EC molecules occurs from its

  

Source: Asscher, Micha - Institute of Chemistry, Hebrew University of Jerusalem

 

Collections: Chemistry