金纳米粒子（GNPs）对氢分子（H₂）的解离具有良好的催化活性. 本文研究了水分子对 GNPs 催化 H₂ 解离的影响. 对于H₂在中性和带正电的金簇（Au_n^δ，n=3~5；δ = 0，1）上的反应，考虑当水簇（(H₂O)_m，m = 1, 2, 3, 7）参与反应时 GNPs 催化H₂的解离过程的热力学和动力学. 研究结果表明，水对 H₂ 在GNPs上的解离有助催化的作用，且水簇大小不同，水助催化 H₂ 在金簇上解离的机理也有所不同，其由氢氢键的均裂解离转化为氧化解离. 对两种机理所得的产物，作者计算了它们的 Raman 和 IR 光谱.

The gold nanoparticles (GNPs) show special activity toward hydrogen (H₂) dissociation, comparing with bulk gold. Such activity is significantly affected by the existence of water. To inspect the influence of water on GNPs catalyzed H₂ dissociation, we carried out density functional theory (DFT) calculations along the reaction paths for water clusters (H₂O)_m (m = 1, 2, 3, 7) assisted H₂ dissociation on gold clusters (Au_n^δ, n = 3 ~ 5; δ = 0, 1). Our calculated results show that water benefits to the H₂ dissociation. The dissociation mechanism varies with the size of water clusters, from the homolytic cleavage of the H-H bond to the oxidation dissociation mechanism on the small gold clusters. We also suggest Raman and IR spectroscopies can be used to characterize the products of those two mechanisms.