C4-Rotational jumps in plastic adamantane the proof of their existence and uniqueness
C4-Rotational jumps in plastic adamantane the proof of their existence and uniqueness
复制标题
C4-塑料金刚烷中的旋转跳跃证明其存在和唯一性
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
R. Lechner
中科院分区：
文献类型：
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作者：
M. Bee;J. Amoureux;R. Lechner
用板状单晶对金刚烷C10H16在301K和373K下进行了大量的准弹性非相干中子散射研究。对样品相对于入射中子束的三个取向进行了多次散射校正。适当地选择动量转移矢量Q的取向和模数以及实验的能量分辨率，使我们能够区分不同的旋转跃迁模型，并证明在实验的时间尺度上，唯一存在的立方旋转是C4型的(分子围绕晶格四对称轴的90°旋转跳跃)。相应的相关时间由下式给出
An extensive quasielastic incoherent neutron scattering study was performed on adamantane, C10H16, at 301 K and at 373 K, using a slab shaped single crystal. Multiple scattering corrections were carried out for three orientations of the sample with respect to the incident neutron beam. A suitable choice of the orientations and of the modulus of the momentum transfer vector Q together with the experimental energy resolution enabled us to distinguish between various rotational jump models and to prove that on the time scale of the experiment the only existing cubic rotations are of the C4-type (90° rotational jumps of the molecules about fourfold symmetry axes of the crystal lattice). The corresponding correlation time is given by