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Sublimative desorption of xenon from Ru(100) Gabriel Kerner, Ori Stein, Yigal Lilach, and Micha Asscher*
 

Summary: Sublimative desorption of xenon from Ru(100)
Gabriel Kerner, Ori Stein, Yigal Lilach, and Micha Asscher*
Department of Physical Chemistry, The Farkas Center for Light Induced Processes, The Hebrew University of Jerusalem,
Jerusalem, 91904 Israel
Received 19 December 2004; published 26 May 2005
Sublimative desorption is a process in which desorption of multilayers of an adsorbate precedes melting and
surface diffusion. Here we report on the desorption kinetics of Xe atoms from multilayer coverage studied
using temperature programmed desorption and optical diffraction methods. It is found that decay of the
diffraction peak intensities from multilayer coverage grating during surface heating cannot be explained as
one-dimensional diffusion process. Instead, the diffraction signal follows Xe desorption, as deduced from
simultaneous linear diffraction and desorption measurements. This observation suggests that no macroscopic
two-dimensional melting and diffusion occur in the case of multilayers of Xe before the onset for desorption.
It is concluded that Xe atoms undergo sublimative desorption from the topmost layers. Similar results were
obtained in the case of water multilayers on Ru 100 . These results suggest that on solid surfaces the desorp-
tion of multilayers is thermodynamically favorable over surface melting or diffusion.
DOI: 10.1103/PhysRevB.71.205414 PACS number s : 68.43. h, 81.15. z, 81.16. c
I. INTRODUCTION
Desorption kinetics of submonolayer Xe coverages from
well-defined metallic surfaces has been extensively studied
by several groups, both experimentally and from the theoret-

  

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

 

Collections: Chemistry