Wavelength dependence of UV photoemission from solvated electrons in bulk water, methanol and ethanol
Wavelength dependence of UV photoemission from solvated electrons in bulk water, methanol and ethanol
复制标题
大量水、甲醇和乙醇中溶剂化电子的紫外光发射的波长依赖性
DOI：
10.1021/acs.jpca.5b09601
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发表时间：
2016
影响因子：
2.9
通讯作者：
and T. Suzuki
中科院分区：
文献类型：
--
作者：
Y. Yamamoto;S. Karashima;S. Adachi;and T. Suzuki
我们测量了水、甲醇和乙醇中溶剂化电子基态的单光子光发射的波长依赖性（340-215 nm）。在每种情况下，垂直电子结合能（VBE）逐渐增加的光子能量，表明光电子动能减少作为电子振动非弹性散射的结果之前，从液体表面发射。与此相反，在DABCO（1，4-二氮杂双环[2，2，2]辛烷），它有一个表面过剩密度的里德伯电子的VBE，显示没有明确的波长依赖性。这些结果表明，溶剂化的电子主要是在散装和VBE使用UV光电子能谱测量的液体一般需要能量校正，以考虑非弹性散射效应。从波长的依赖性，我们重新估计的溶剂化电子在散装水，甲醇和乙醇的VBE分别为3.3，3.1和3.1 eV。水合电子也确定了光电子能谱使用90 nm的辐射。
We have measured the wavelength dependence (340–215 nm) of one-photon photoemission from the ground electronic state of solvated electrons in bulk water, methanol, and ethanol. In every case, the vertical electron binding energy (VBE) gradually increased with photon energy, indicating that the photoelectron kinetic energy diminishes as a result of electron–vibration inelastic scattering prior to emission from the liquid surface. In contrast, the VBE of the Rydberg electron in DABCO (1,4-diazabicyclo[2,2,2]octane), which has a surface-excess density, revealed no clear wavelength dependence. These results suggest that the solvated electrons are created predominantly in the bulk and that VBEs measured using UV photoemission spectroscopy of liquids generally require energy corrections to account for inelastic scattering effects. From the wavelength dependence, we have re-estimated the VBEs of solvated electrons in bulk water, methanol, and ethanol to be 3.3, 3.1, and 3.1 eV, respectively. Hydrated electrons were also identified by photoemission spectroscopy using 90 nm radiation.