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The 5-parameter Morse potential (5-MP) method for the interaction between O atom and Cr surfaces is constructed in the present work. The adsorption of O on Cr (100), (110), (111), and (211) surfaces are studied with 5-MP in detail. The fourfold hollow site of the Cr (100) surface is favored for O atom. On Cr (110), quasithreefold site is favored with the parallel frequencies (the frequencies of O atom paralleling the metal surface) of 342 and 538 , and perpendicular frequency (the frequency of O atom perpendicular to the metal surface) at 526 . On Cr (111), the most favored mode for O atom is found to be the quasi-threefold site with the perpendicular frequency at 553 and the parallel frequencies at 253 and 399 . According to our calculation results, we speculate the most preferred mode for O adsorption on Cr (211) surface is the quasithreefold site with the perpendicular frequency at 583 and the parallel frequencies at 449 and 185 .

Adsorption of O Atom on Cr (100), (110), (111), and (211) Surfaces: An 5-Parameter Morse Potential Method Study