Adsorption-desorption of F2 diatomic molecule on Ti (100) surface at different coverages

Enhanced Saturation Coverages in Adsorption-Desorption Processes

Many experimental studies of protein deposition on solid surfaces involve alternating adsorption/desorption steps. In this paper, we investigate the effect of a desorption step (separating two adsorption steps) on the kinetics, the adsorbed-layer structure, and the saturation density. Our theoretical approach involves a density expansion of the pair distribution function and an application of a...

Nitrogen adsorption and desorption at iron pyrite FeS2{100} surfaces.

We have investigated the interaction of nitrogen with single-crystal iron pyrite FeS(2){100} surfaces in ultra-high vacuum. N(2) adsorbs molecularly at low temperatures, desorbing at 130 K, but does not adsorb dissociatively even at pressures up to 1 bar. Atomic surface N can, however, be obtained with nitrogen ions and/or excited neutral species, generated by passing N(2) through an ion gun. S...

Phosphorus adsorption and desorption behavior on sediments of different origins

Purpose The aim of this study was to assess phosphorusretention (Pret) capacities via P adsorption (Pads) and desorption (Pdes) by sediments collected from six different sources associated with various origins, physical, and chemical characteristics. Materials and methods Sediment samples were collected in the State of Florida, the USA, from estuary, marine, wetland, canal, river, and lake, res...

Adsorption of Hydrogen on a Nickel (100) Surface

The adsorption of hydrogen on a clean Ni(100) single crystal surface was studied in UHV between 120 K and 500 K means of LEED, thermal desorption spectroscopy and work function measurements. H2 chemisorption occurs in two atomic states ßi and ßz with maximum desorption rates (at saturation) at 318 K and 348 K. The activation energy for desorption was determined to be 20 ( ± 2) kcal/mole for the...

D2 dissociative adsorption on and associative desorption from Si(100): Dynamic consequences of an ab initio potential energy surface