ScholarWorks@숙명여자대학교

초록

The dissociative adsorption of water molecules on Si(001) was studied up to 850 K by scanning tunneling microscopy. Water molecules dissociate into OH and H fragments to form on-dimer (OD) and interdimer (ID) configurations, and the population ratio n(ID)/n(OD) is measured to change from similar to 5 at room temperature to the saturation value of similar to 0.6 above 500 K, contradicting to the prediction from the static transition-state theory. The sticking coefficient also shows an abnormal temperature dependence. The temperature dependence in the H dissociation and in the molecular adsorption can be elucidated only by taking into account the flip-flop motion of Si dimers.

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