Le Guen K, Ahmad M, Céolin D, Lablanquie P, Miron C, Penent F, Morin P, Simon M
Laboratoire de Chimie-Physique, Matière et Rayonnement (LCPMR), UMR 7614, Université P. et M. Curie, 11 rue P. et M. Curie, F-75231 Paris cedex 05, France.
J Chem Phys. 2005 Aug 22;123(8):084302. doi: 10.1063/1.2008256.
To get further insight into the CH2BrCl site-selective fragmentation previously observed upon inner-shell ionization, we have performed high-resolution Br 3d and Cl 2p Auger and spin-orbit resolved Br 3d Auger spectra, and studied the dissociation properties of the CH2BrCl2+ dication formed at threshold by means of threshold electron pair-ion coincidence measurements. The key point is that the origin of site-specific bond breaking is found in the Auger decay itself, as it preferentially populates selected dication states. Whereas the predominance of the C-Br bond breaking is observed in both threshold and inner-shell studies, no signature of selective C-Cl rupture is reported for the dication formed at threshold.
为了更深入地了解之前在内壳层电离时观察到的CH2BrCl的位点选择性碎片化，我们进行了高分辨率的Br 3d和Cl 2p俄歇光谱以及自旋轨道分辨的Br 3d俄歇光谱，并通过阈值电子对-离子符合测量研究了在阈值处形成的CH2BrCl2+二价阳离子的解离特性。关键在于，位点特异性键断裂的起源在于俄歇衰变本身，因为它优先填充选定的二价阳离子态。虽然在阈值和内壳层研究中都观察到了C-Br键断裂占主导，但对于在阈值处形成的二价阳离子，没有报道选择性C-Cl断裂的特征。
