Generation and High‐Resolution Photoelectron Spectroscopy of Small Organic Radicals in Cold Supersonic Expansions
Generation and High‐Resolution Photoelectron Spectroscopy of Small Organic Radicals in Cold Supersonic Expansions
复制标题
冷超音速膨胀中小有机自由基的产生和高分辨率光电子能谱
DOI：
10.1002/hlca.200390100
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发表时间：
2003
影响因子：
1.8
通讯作者：
F. Merkt
中科院分区：
文献类型：
--
作者：
S. Willitsch;J. Dyke;F. Merkt
本文提出了一种气相超声冷膨胀产生自由基的一般方法。该方法依赖于合适的前体分子的准分子激光光解在一个薄的石英毛细管安装在一个脉冲气体喷嘴的孔口，可以很容易地结合真空紫外光电离质谱和高分辨率光电子能谱研究的反应性和旋转电子能级结构的中性自由基和它们的离子，以及确定高度准确的绝热电离能。的自由基源的特性进行了详细描述，其性能说明了质谱和高分辨率光电子能谱调查NH2，CH2，CH3，C2H，C2H3，和C2H5。该自由基源不仅适用于制备冷样品（旋转温度约为100 ℃），30 K）的中等反应性的自由基，如NH 2、CH 3或C2H5，但它也可用于制备高反应性的自由基（例如，C2H）用于光谱研究。
A general method of generating radicals in cold supersonic expansions in the gas phase is presented. The method relies on excimer laser photolysis of suitable precursor molecules in a thin quartz capillary mounted at the orifice of a pulsed gas nozzle and can easily be combined with vacuum-UV photoionization mass spectrometry and high-resolution photoelectron spectroscopy to study the reactivity and the rovibronic energy level structure of neutral radicals and their ions, as well as to determine highly accurate adiabatic ionization energies. The characteristics of the radical source are described in detail, and its performance is illustrated by mass spectrometric and high-resolution photoelectron spectroscopic investigations of NH2, CH2, CH3, C2H, C2H3, and C2H5. The radical source is not only suitable to produce cold samples (rotational temperature of ca. 30 K) of radicals of moderate reactivity, such as NH2, CH3, or C2H5, but it is also useful to prepare highly reactive radicals (e.g., C2H) for spectroscopic investigations.