Low-energy photoelectron–vacuum ultraviolet (VUV) photon coincidences have been measured using synchrotron radiation excitation in the inner-valence region of the nitric oxide molecule. The capabilities of the coincidence set-up were demonstrated by detecting the 2s−1 → 2p−1 radiative transitions in coincidence with the 2s photoelectron emission in Ne. In NO, the observed coincidence events are attributed to dissociative photoionization with excitation, whereby photoelectron emission is followed by fragmentation of excited NO+ ions into O+ + N* or N+ + O* and VUV emission from an excited neutral fragment. The highest coincidence rate occurs with the opening of ionization channels which are due to correlation satellites of the 3σ photoionization. The decay time of VUV photon emission was also measured, implying that specific excited states of N atoms contribute significantly to observed VUV emission.
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机译:使用一氧化氮分子内价区域中的同步加速器辐射激发,已经测量了低能光电子-真空紫外(VUV)光子符合。通过检测2s-1→2p-1辐射跃迁与Ne中2s的光电子发射相一致,证明了符合设置的能力。在NO中,观察到的重合事件归因于激发引起的离解光电离,在光电子发射之后,被激发的NO +离子碎裂为O + + N *或N + + O *,并且从被激发的中性片段发出VUV发射。最高的重合率发生在电离通道的打开,这是由于3σ光电离的相关卫星引起的。还测量了VUV光子发射的衰减时间,这意味着N原子的特定激发态对观察到的VUV发射有显着贡献。
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