通过高分辨率非弹性中子散射研究氟甲烷中甲基的旋转动力学和甲基旋转耦合。
Rotational dynamics and coupling of methyl group rotations in methyl fluoride studied by high resolution inelastic neutron scattering.
作者信息
Kirstein O, Prager M, Schneider G J
机构信息
Australian Nuclear Science and Technology Organisation, The Bragg Institute, Lucas Heights, New South Wales 2234, Australia.
出版信息
J Chem Phys. 2009 Jun 7;130(21):214508. doi: 10.1063/1.3141384.
Methyl group rotations in methyl fluoride were studied using the high flux backscattering spectrometer SPHERES at FRM-II. The asymmetry and width of the low temperature tunneling peak was used to determine if coupled rotations between neighboring methyl fluoride molecules exist. The temperature dependent broadening of the tunneling peak was used to determine the first librational transition and compared to the temperature dependent shift of the position of the tunneling peak. The results obtained by using inelastic neutron scattering confirm previous models that assume rotational coupling. This is the first neutron backscattering experiment with sub-microeV resolution at energy transfers up to 31 microeV.
利用慕尼黑工业大学第二研究反应堆的高通量背散射光谱仪SPHERES研究了氟甲烷中的甲基旋转。低温隧穿峰的不对称性和宽度被用于确定相邻氟甲烷分子之间是否存在耦合旋转。隧穿峰随温度的展宽被用于确定首次摆动跃迁，并与隧穿峰位置随温度的移动进行比较。通过非弹性中子散射获得的结果证实了先前假设存在旋转耦合的模型。这是首次在能量转移高达31微电子伏特时具有亚微电子伏特分辨率的中子背散射实验。
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