TDS and Work Function Correspondence

TDS from an O-Pd(OOl) surface exhibits the same trend [2]. The Pd(OOl) surfaces exposed to oxygen at 350 K temperature results in a single TDS peak at 850 K. The peak shifts from 850 K at lower coverage to 800 K after a 10 L exposure at which the highest temperature peak saturates. After the 800 K peak saturates, a new TDS peak appears at 700 K that saturates at an exposure of 20 L. 

Relaxation of the Chemical Bond, Springer Series in Chemical Physics 108, DOI 10.1007/978-981-4585-21-7 5, Springer Science+Business Media Singapore 2014 

Meanwhile, another peak shows up at 650 K, which shifts toward 700 K with further increase in exposure. Above 1,000 L, the oxygen uptake slows and an additional peak shoulder at 600 K presents. 

The exposure-derived A j) of the O-Pd(llO) surface agrees with that of the O-Ru(OOOl) surface [3, 4] and the O-Gd(OOOl) surface as well [5]. The A(j for the O-Pd(llO) surface changes in the following ways [1]  

Combining the TDS profiles and LEED crystallography of the O-Rh(llO) surface, Schwarz et al. [7] correlated the TDS peaks to the LEED patterns of various reconstructed phases. Comelli et al. [6] reinterpreted the TDS data of the O-Rh(llO) surface based on the known adsorbate s locations. The most stable structure corresponds to the p2mg phase and so the adsorbate binds to the surface more strongly. Due to the repulsive interactions, the adsorbate in the unreconstructed troughs binds to the surface weakly. 

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