Moro Ramiro, Rabinovitch Roman, Xia Chunlei, Kresin Vitaly V
Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-0484, USA.
Phys Rev Lett. 2006 Sep 22;97(12):123401. doi: 10.1103/PhysRevLett.97.123401. Epub 2006 Sep 18.
The response of (H2O)(n=3-18) clusters to an electric field is studied by beam deflection. All clusters deflect uniformly, behaving as polarizable particles. The effective polarizabilities exceed the electronic component and increase as the clusters are cooled, revealing a large permanent dipole contribution. The results resolve a discrepancy concerning the polarity of water clusters and show that all species access conformations with moments exceeding 1 D. The data show no evidence for a freezing transition down to approximately 120 K, but suggest a shift in the conformer arrangement at n=8-9.
通过束流偏转研究了(H2O)(n = 3 - 18)团簇对电场的响应。所有团簇均均匀偏转，表现为可极化粒子。有效极化率超过电子分量，并且随着团簇冷却而增加，这表明存在很大的永久偶极贡献。这些结果解决了关于水团簇极性的一个争议，并表明所有物种都能形成矩超过1 D的构象。数据显示，在大约120 K以下没有冻结转变的证据，但表明在n = 8 - 9时构象排列发生了变化。
