K_(2)OsO_(2)(OH)_(4)低温拉曼光谱研究  

Low-temperature Spectroscopy study of K_(2)OsO_(2)(OH)_(4)

作　　者：唐琦琪 刘静仪 吴彬彬 范春梅 雷力[1,2,3] TANG Qiqi;LIU Jingyi;WU Binbin;FAN Chunmei;LEI Li(Institute of Atomic and Molecular Physics,Sichuan University,610065 Chengdu,People’s Republic of China)

机构地区：[1]四川大学原子与分子物理研究所,成都610065 [2]广东正信硬质材料技术研发有限公司,广东河源517000 [3]四川大学高能量密度物理与技术教育部重点实验室,四川成都610065

出　　处：《光散射学报》2022年第2期149-152,共4页The Journal of Light Scattering

基　　金：国家自然科学基金项目(11774247)。

摘　　要：本工作获得了低温下锇酸钾K_(2)OsO_(2)(OH)_(4)的拉曼光谱,并对其声子行为进行了研究。在低温下,K_(2)OsO_(2)(OH)_(4)的拉曼光谱信噪比和展宽都得到改善,由晶胞收缩引起的晶体场扰动使位于高波段的ν_(1)模分裂为ν′_(1)和ν″_(1)两个振动模;而晶体中氢键体系取向的重定向行为使ν_(2)模在低温下发生了不连续变化。At low temperature,the vibration mode of K_(2)OsO_(2)(OH)_(4) in low wavenumber has no obvious change,but the O-H vibration in high wavenumber is affected by low temperature with some interesting phenomena appearing.Low temperature leads to the intensity of A(2)_(1g) increased as well as makes asymmetric stretching modes more distinguished.A perturbation of the crystal field caused by a contraction of the cell makesν_(1) split into two components ν′_(1) and ν″_(1) at-90℃.Also,a reorientation of the coupled and hydrogen-bonded system in the lattice of K_(2)OsO_(2)(OH)_(4) occurs at low temperature makes a discontinuity of ν_(2) at this temperature.

关 键 词：二水合锇酸钾K_(2)OsO_(2)(OH)_(4) 低温拉曼 氢键 

分 类 号：O513.43[理学—低温物理]