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由高能电子束激发成功地观测到来自内壳层电离态Ｃｓ２＋Ｆ－（与ＸｅＦ具有等电子序的结构）的两个离子准分子发射带。其中心在１８５ｎｍ的强发射带被标记为来自Ｃｓ２＋Ｆ－离子准分子的Ｂ－Ｘ带束缚一自由跃迁．１５２ｎｍ附近的发射带是来自于Ｃｓ２＋Ｆ－的Ｄ—Ｘ带连续辐射。
Two ion exciton emission bands from the inner shell ionized state Cs2 + F- (having an isoelectronic sequence with XeF) were successfully observed by high-energy electron beam excitation. The strong emission band centered at 185 nm is labeled as a B-X band bound free-transition from Cs2 + F-ion excimer. The emission band near 152 nm is a continuous D-X band radiation from Cs2 + F-.