Atom-superposition electron-delocalization method

The same theoretical methods have been applied to ethylidyne absorbed in the Rh(100) surface, with the conclusion, as experimentally found, that this species will be stable on the 4-fold site (237). However, the extended-Hiickel treatment, as well as the atom-superposition and electron-delocalization molecular orbital (ASED-MO) method, predict that the CC bond length will be shorter, and hence the vCC mode higher in wavenumber on the 4-fold site, whereas experimentally... 

Anderson and Grantscharova conducted one of the first studies on the CO oxidation on Pt using a molecular orbital theory with a simple molecular model.113 They used an atom superposition and electron delocalization molecular orbital (ASED-MO) method to investigate the electrochemical oxidation of the adsorbed CO on the Pt anodes. They found that the interaction of CO(ads) with the oxidant OH(ads) was effective only at high surface coverage. 

The atom superposition and electron delocalization molecular orbital (ASED-MO) method is a semiempirical approach used to predict molecular strucures, stabilities, force constants, electronic properties, and reaction pathways (466-472). The molecular binding energy, E, involved in chemical bond formation is regarded as a sum of repulsive atom superposition energy, and an attractive electron delocalization energy, Eq that is,... 

For hydrogen-treated M0S2, possible hydrogen species are shown in Fig. 7.31 with their calculated vibration frequencies according to the atom superposition and electron delocalization molecular orbital method [134]. Typical spectra of hydrogen-treated RuS2 and M0S2 [130,131] are shown in Fig. 7.32. 

Some of the first quantum-mechanical descriptions of the electrochemical interface were developed by Anderson, utilizing an atom superposition and electron delocalization molecular orbital method (ASED-MO) to generate potential surfaces for the reactant and product states using a cluster model of the electrode surface [27,32,34,49,50]. The activation barrier and equilibrium potential were extracted from the potential surfaces in a manner reminiscent of Marcus theory [51]. Recently, this approach has been... 

Except for the divergence of the adsorption energy from the experimental values, the results reported (Table 1) are not consistent with each other because of the different calculation methods and parameters involved in calculations. Legate et alP utilized a version of Anderson s atom superposition and electron delocalization (ASED)-MO theory and obtained the chemisorption energy of CO on Co(OOOl) as high as —4.47 eV, even much higher than experimental results. 

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