Radiative double-electron capture (RDEC) involves the transfer of two electrons with the simultaneous emission of a single photon. This process, which can be viewed as the inverse of double photoionzation, has been studied for 2.11  MeV/u F^{9+} and F^{8+} ions striking gas targets of N_{2} and Ne. The existence of RDEC is conclusively shown for both targets and the results are compared with earlier O^{8+} and F^{9+} findings for thin-foil carbon and with theory. The data for the carbon target showed some evidence for the existence of RDEC, but the interpretation was clouded by high-probability, unavoidable multiple collisions causing the exiting charge state to be increased.

中文翻译：

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气体目标上的裸电子和单电子离子进行的辐射双电子捕获。

辐射双电子捕获（RDEC）涉及两个电子的转移，同时发射单个光子。对于撞击N_ {2}和Ne的气体目标的2.11 MeV / u F ^ {9+}和F ^ {8+}离子，已经研究了该过程，该过程可以看作是两次光电离的逆过程。最终显示了两个目标均存在RDEC，并将结果与​​较早的O ^ {8+}和F ^ {9+}发现的薄箔碳以及理论值进行了比较。碳靶标的数据显示了存在RDEC的一些证据，但解释因高概率而难以理解，不可避免地发生了多次碰撞，从而导致现有电荷状态增加。