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Surface-extended x-ray-absorption fine-structure studies on the c(4×{}2)-NO/Ni(111) system yield a nearest-neighbor O-Ni distance of 2.68±{}0.05 A{} and show that NO adsorbs in threefold-coordinated hollow sites. This result casts doubt on the generally used method of adsorption site determination via molecular vibrational frequencies, which for this system led to an assignment of a twofold bridge site.
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Aminpirooz et al. (1992) studied this question.
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