环氧丙烷的双光电离：一对价层电子射出的符合研究
Double photoionization of propylene oxide: a coincidence study of the ejection of a pair of valence-shell electrons
摘要：
环氧丙烷是圆二色性的实验和理论研究的一个最受欢迎的目标，最近在星际空间被发现，进一步放大了对它在当前关于原始生物同手性的争论中的作用的关注。在本工作中，利用离子成像探测器和可调谐同步辐射（18.0-37.0 eV），采用光电子-光离子-光离子符合技术，可以：（i）观察到六个双电离碎裂通道，它们的相对产额约占耦合的三分之二（C2 H4+，CH 2 O+），五分之一（C2 H3+，CH 3 O+）;（二）-测量阈值为他们的开口作为光子能量的函数;（三）-解开一个明显的双峰的动能释放分布，指纹的竞争性非绝热机制。
英文摘要：
Propylene oxide, a favorite target of experimental and theoretical studies of circular dichroism, was recently discovered in interstellar space, further amplifying the attention to its role in the current debate on protobiological homochirality. In the present work, a photoelectron-photoion-photoion coincidence technique, using an ion-imaging detector and tunable synchrotron radiation in the 18.0-37.0 eV energy range, permits: (i)-to observe six double-ionization fragmentation channels, their relative yields being accounted for about two-thirds by the couple (C2H4+, CH2O+), one-fifth by (C2H3+, CH3O+); (ii)-to measure thresholds for their openings as a function of photon energy; (iii)-to unravel a pronounced bimodality for a kinetic-energy-released distribution, fingerprint of competitive non-adiabatic mechanisms.
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