Incoherent inelastic neutron scattering measurements on ice VII:: Are there two kinds of hydrogen bonds in ice?
Incoherent inelastic neutron scattering measurements on ice VII:: Are there two kinds of hydrogen bonds in ice?
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DOI：
10.1209/epl/i2005-10270-4
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发表时间：
2005-11-01
期刊：
影响因子：
--
通讯作者：
Parker, SF
中科院分区：
文献类型：
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作者：
Klotz, S;Strässle, T;Parker, SF
我们报告的非弹性非相干中子散射测得的振动光谱恢复冰VII和比较这完全氢有序的形式，冰VIII，在完全相同的条件下（15 K，1巴）的类似数据。这两个阶段的光谱有其主要特点，在类似的能量，在这两个平移和librational带，与大量的无序相关的扩大冰VII。特别是，我们没有发现任何证据表明，在49毫电子伏的峰值在冰VII这是与可能存在的两种氢键。在冰VII和冰VIII中的另外的拉曼测量表明，在两相中的O-H伸缩频率几乎相同。因此，分裂的分子光学带在冰相，包括普通冰Ih的存在下，可能与声子色散的不完整描述有关，而不是氢键性质的一个根本性的新特征。
We report the vibrational spectrum of recovered ice VII measured by inelastic incoherent neutron scattering and compare this to similar data of its fully hydrogen-ordered form, ice VIII, under exactly the same conditions (15 K, 1 bar). The spectra of the two phases have their principal features at similar energies, in both the translational and librational bands, with a substantial disorder-related broadening in ice VII. In particular, we find no evidence for a peak at 49 meV in ice VII which earlier was associated with the possible existence of two kinds of hydrogen bonds. Additional Raman measurements in ice VII and ice VIII show that the O-H stretching frequencies in the two phases are almost identical. Therefore, the presence of split molecular-optic bands in ice phases, including ordinary ice Ih, is likely related to an incomplete description of the phonon dispersion rather than to a fundamentally new feature in the nature of the hydrogen bond.