X射线光电子能谱
离子液体
紫外光电子能谱
化学
亚稳态
电子光谱学
光谱学
分析化学(期刊)
电子结构
光电发射光谱学
离子键合
价(化学)
物理化学
离子
核磁共振
计算化学
有机化学
量子力学
物理
催化作用
作者
Oliver Höfft,Stephan Bahr,Marcel Himmerlich,Stefan Krischok,Juergen A. Schaefer,V. Kempter
出处
期刊:Langmuir
[American Chemical Society]
日期:2006-07-14
卷期号:22 (17): 7120-7123
被引量:182
摘要
The near-surface electronic structure of the room-temperature ionic liquid (RT-IL) 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][Tf(2)N]) has been investigated with the combination of the electron spectroscopies metastable impact electron spectroscopy (MIES), ultraviolet photoelectron spectroscopy (UPS (HeI and HeII)), and monochromatized X-ray photoelectron spectroscopy (XPS). We find that the top of the valence band states originates from states of the cation (see also ref 1). The ultimately surface-sensitive technique MIES proves that the surface layer consists of both cations and anions. The temperature dependence of the spectra has been measured between about 160 and 610 K. Information on the glass transition and the possibility for low-temperature distillation of [EMIM][Tf(2)N] at reduced pressures is derived from the present results.
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