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Inelastic Neutron Scattering Study of Water in Hydrated LTA-Type Zeolites

机译:水合LTA型沸石中水的非弹性中子散射研究

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The vibrational dynamics of water molecules encapsulated in synthetic Na-A and Mg-exchanged A zeolites were studied versus temperature by inelastic neutron scattering(INS)measurements(30-1200 cm~(-1))as a function of the induced ion-exchange percentage by using the indirect geometry tof spectrometer TOSCA at the ISIS pulse neutron facility(RAL,UK).The experimental INS spectra were compared with those of ice Ih to characterize the structural changes induced by confinement on the H_2O hydrogen-bonded network.We observed,after increasing the Mg~(2+)content,a tendency of water molecules to restore the bulklike arrangements together with more hindered dynamics.These results are confirmed by the analysis of the evaluated one-phonon amplitude-weighted proton vibrational density of states aimed,in particular,to follow the evolution of the water molecules librational mode region.
机译:用非弹性中子散射(INS)测量(30-1200 cm〜(-1)),研究了合成的Na-A和Mg交换的A分子筛中水分子随温度变化的振动动力学与诱导的离子交换的关系。通过使用ISIS脉冲中子设施(RAL,UK)上的间接几何tof光谱仪TOSCA测得5%的百分数。将实验INS光谱与冰Ih的光谱进行比较,以表征由限制在H_2O氢键网络上引起的结构变化。在增加Mg〜(2+)含量后,水分子有恢复体相排列的趋势,同时动力学受到更多的阻碍。这些结果通过对目标态的单声子振幅加权质子振动密度的分析得到了证实。尤其是跟随水分子自由模式区域的演变。

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