SITE-SELECTIVE FRAGMENTATION IN CORE-EXCITED BROMO-CHLORO-ALKANES [BR(CH2)(N)CL]
SITE-SELECTIVE FRAGMENTATION IN CORE-EXCITED BROMO-CHLORO-ALKANES [BR(CH2)(N)CL]
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DOI：
10.1063/1.467558
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发表时间：
1994-09-01
影响因子：
4.4
通讯作者：
NENNER, I
中科院分区：
文献类型：
--
作者：
SCHMELZ, HC;REYNAUD, C;NENNER, I
本文报道了溴氯代烷烃[Br（CH_2）（n）Cl]（n=1，.，3），采用多符合模式的飞行时间质谱和单色化同步辐射分别激发溴3d（65-150 eV）和氯2 p边（150-220 eV）附近。我们观察到强烈的差异激发后的两个边缘，其中对于所有三个分子的激发卤素原子和分子的其余部分之间的键断裂优先的碎片。这个网站的选择性进行了讨论，在一个快速的两个和三体碎裂后发生的主要俄歇衰变的核心空缺，但在相同的时间尺度进一步自电离。
We report strong site-selective ionic fragmentation of the core-excited bromo-chloro-alkanes [Br(CH2)(n)Cl] (n=1,...,3), using time-of-flight mass spectrometry in the multicoincidence mode and monochromatized synchrotron radiation to excite the vicinity of the bromine 3d (65-150 eV) and chlorine 2p edge (150-220 eV), respectively. We observe strong differences between the fragmentation after excitation of the two edges, where for all three molecules the bond between the excited halogen atom and the rest of the molecule is broken preferentially. This site selectivity is discussed in terms of a fast two- and three-body fragmentation which takes place after the primary Auger decay of the core vacancy but on the same time scale as further autoionization.