Lemelin V, Bass A D, Cloutier P, Sanche L
Groupe en Sciences des Radiations, Département de Médecine Nucléaire et Radiobiologie, Faculté de Médecine et Sciences des Radiations, Université de Sherbrooke, Sherbrooke, Québec J1H 5N4, Canada.
J Chem Phys. 2016 Feb 21;144(7):074701. doi: 10.1063/1.4941377.
Absolute cross sections (CSs) for vibrational excitation by 1-19 eV electrons impacting on condensed tetrahydrofuran (THF) were measured with a high-resolution electron energy loss spectrometer. Experiments were performed under ultra-high vacuum (3 × 10(-11) Torr) at a temperature of about 20 K. The magnitudes of the vibrational CSs lie within the 10(-17) cm(2) range. Features observed near 4.5, 9.5, and 12.5 eV in the incident energy dependence of the CSs were compared to the results of theoretical calculations and other experiments on gas and solid-phase THF. These three resonances are attributed to the formation of shape or core-excited shape resonances. Another maximum observed around 2.5 eV is not found in the calculations but has been observed in gas-phase studies; it is attributed to the formation of a shape resonance.
使用高分辨率电子能量损失光谱仪测量了能量为1 - 19电子伏特的电子撞击凝聚态四氢呋喃（THF）时振动激发的绝对截面（CSs）。实验在超高真空（3×10⁻¹¹托）和约20K的温度下进行。振动CSs的大小在10⁻¹⁷平方厘米范围内。将在CSs的入射能量依赖性中在4.5、9.5和12.5电子伏特附近观察到的特征与气相和固相THF的理论计算结果及其他实验结果进行了比较。这三个共振归因于形状共振或芯激发形状共振的形成。在2.5电子伏特左右观察到的另一个最大值在计算中未发现，但在气相研究中已观察到；它归因于形状共振的形成。
