Vibration properties of low-fraction hydrogen in deuterium ices

• 来源期刊: 中国物理（英文版）
• 关键词: neutron scattering defect vibration modes Gaussian fit
• 年，卷（期）: 2005,（10）
• 页码范围: 1942-1945
• 页数: 4页
• 语种: 英文

摘要

Inelastic incoherent neutron scattering spectra of D2O high-density amorphous (hda) ice, ice-Ⅷ and ice-Ⅱ mixed with small amount of H2O (＜5%) have been measured recently on high-energy transfer spectrometer at Rutherford Appleton Laboratory (UK). The hydrogen atom on D2O ice lattices has three distinguished vibrational modes, two bending at low frequencies and one stretching at high frequencies, and their frequencies are slightly different for different phases of ice. It was found that the lower one of the bending modes is located at ～95 meV for hda-ice, at ～95 meV for ice-Ⅷ and at ～96 meV for ice-Ⅱ and they are all lower than the value of 104 meV for ice-Ih. It was also measured that the O-D and O-H covalent bond stretching modes of ice-Ⅷ are at ～315 and ～425 meV, ice-Ⅱ at 307 and ～415 meV, hda-ice at 312 and ～418 meV, respectively. They are significantly higher than the values of ice-Ih at ～299 and ～406 meV,respectively.