A Discussion on photoelectron spectroscopy - Molecular photoelectron spectroscopy
A Discussion on photoelectron spectroscopy - Molecular photoelectron spectroscopy
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DOI：
10.1098/rsta.1970.0059
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发表时间：
1970
期刊：
影响因子：
--
通讯作者：
David Warren Turner
中科院分区：
文献类型：
--
作者：
David Warren Turner
概述了分子蒸气的氦584A光电子能谱的主要特征。讨论了影响观察到的能带数的因素及其与占据电子能级数的关系。考虑了分子平移速度对可获得的基本谱线宽度的影响，结果表明，与离子分解引起的更为常见的谱线展宽相比，分子平移速度的影响是显著的，尽管一般很小。尖锐的线条通常与经典的独行线的存在联系在一起，但也有例外。指出了氯、溴化合物孤对电离的结构效应。给出了电离产生的振动频率变化与绝热电离能和垂直电离能差之间的关系的一些证据。以甲基氟化物、1，1-二氟乙烯、六氟化硫、烯酮和吡嗪为例，举例说明了这种关联在振动精细结构分析中的应用。体育与体育的比较。丁二烯、丙烯醛和乙二醛的光谱被用来表明该方法在绘制相关系列化合物的能级图方面的有效性。
The principal features of helium 584 A photoelectron spectra of molecular vapours are outlined. Factors affecting the number of bands observed and their relation to the number of occupied electronic energy levels are discussed. The effect of the molecular translational velocity on the fundamental line widths attainable is considered and is shown to be significant though generally small compared with the much more common line broadening arising from ionic decomposition. Sharp lines are often to be associated with the presence of classical lone pairs but exceptions are noted. Structural effects in the lone pair ionization of chloro- and bromo-compounds are indicated. Some evidence is given for a correlation between the change in vibrational frequency produced upon ionization and the difference between adiabatic and vertical ionization energies. The use of such a correlation in the analysis of vibrational fine structure is exemplified by considering the examples of methylfluoride, 1,1-difluoroethylene, sulphur hexafluoride, ketene and pyrazine. A comparison between the p.e. spectra of butadiene, acrolein and glyoxal is used to indicate the utility of the method in creating energy level diagrams for related series of compounds.