Sublimative desorption of xenon from Ru(100)

Abstract

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 Ru͑100͒. These results suggest that on solid surfaces the desorption of multilayers is thermodynamically favorable over surface melting or diffusion.

Solid-state dewetting-mediated aggregation of nanoparticles

“…34 Regardless of the substrate, significant diffusion of Xe occurs prior to desorption, indicating that data previously interpreted as suggesting layer-by-layer desorption should be reevaluated to account for dewetting. 35…”

Fermi surfaces of single layer dielectrics on transition metals

“…For the case of h-BN/Ni the interpretation of phonon dispersions [38] and high energy X-ray absorption probes [39] inferred metallicity. The low sticking coefficient of cobalt on h-BN/Ni(111) [17], the peculiar behavior of C 60 on h-BN/Ni(111) [18] and the fact that the bond energy of Xe on h-BN/Rh (111) is in between first and second layer Xe adsorption energies [36,40], are, on the other hand, indicative for a low density of states at the Fermi level at the vacuum h-BN interface. Certainly, metallicity is given for an overlayer, if new bands cross the Fermi level.…”

Patterning thin metallic film via laser structured weakly bound template

“…2. The laser power used for both the Xe grating formation (1.7-2.2 MW/cm 2 or 0.017-0.022 J/cm 2 ) and the second pulse (3-6 MW/cm 2 or 0.03-0.06 J/cm 2 ) are well below surface damage threshold [7,8,13].…”

“…1(B). This Xe multilayer grating was recently shown to stay stable up to its desorption temperature at 55 K [13]. A thin metallic layer of gold is then deposited (thermal evaporation, see Ref.…”

“…A weakly bound buffer layer is laser-structured prior to deposition of the metal film, and serves as a template for the material to be deposited [13]. A second, uniform laser pulse is then used in order to eject and remove the excess buffer atoms and the undesired metal residue on top.…”