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Study of SF6 adsorption on graphite using infrared spectroscopy

机译:红外光谱法研究SF6在石墨上的吸附

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We report an experimental study of adsorbed monolayers of SF_6on graphite using infrared reflectionabsorption spectroscopy supplemented by ellipsometry. The asymmetric S–F stretch mode v_3near948 cm~(-1)in the gas is strongly blueshifted film by dynamic dipole coupling. This blueshiftis very sensitive to the intermolecular spacing in the SF_6layer. We convert the measured frequencyv_3to a lattice spacinga,using self-consistent field calculation, calibrated by the frequency in thecommensurate phase. The resolution in lattice spacing is 0.002 A, although there is a largersystematic uncertainty associated with nondynamic-dipole contributions to the frequency shift. Wemap the commensurate-incommensurate transition, a transition between two incommensuratephases, and the melting transition. These results are compared to previous x-ray data. We provide anew determination of the layer critical point (156 K), the layer condensation line down to 110 K, andthe spreading pressure at saturation in this temperature range.
机译:我们报告了使用椭圆反射法补充红外反射吸收光谱法对石墨中SF_6吸附的单分子膜的实验研究。气体中的不对称SF拉伸模式v_3near948 cm〜(-1)是通过动态偶极耦合而强烈蓝移的薄膜。这种蓝移对SF_6层中的分子间间距非常敏感。我们使用自洽场计算将测得的频率v_3转换为晶格间距a,并通过相应相位中的频率进行校准。晶格间距的分辨率为0.002 A,尽管存在较大的系统不确定性,这与非动态偶极子对频移的影响有关。我们映射了相应的不等价过渡,两个不相应的相之间的过渡以及熔化的过渡。将这些结果与先前的X射线数据进行比较。我们提供了新的层临界点(156 K),低至110 K的层凝结线以及在此温度范围内饱和时的扩散压力的确定。

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