The absolute photoionization cross section of vinyl alcohol was determined by multiplexed photoionization mass spectrometry of the Norrish type II photodissociation of butanal at 308 nm. The measured cross sections at 10.005 and 10.205 eV are 7.5 ± 1.9 and 8.1 ± 1.9 MB, respectively. A higher signal-to-noise ratio photoionization spectrum of vinyl alcohol was recorded via the pyrolysis of 2-chloroethanol and scaled to the absolute cross sections measured using the Norrish type II method. From a comparison of our spectrum with previously reported photoelectron spectra we conclude that vinyl alcohol is mainly ionized by direct ionization in the energy range of 9–9.6 eV, whereas autoionization is responsible for the steady rise in the photoionization spectrum above the end of the Franck–Condon envelope at 9.9 eV.

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最简单的烯醇乙烯醇的绝对光电离截面

乙烯醇的绝对光电离截面通过丁醛的 Norrish II 型光解离的多重光电离质谱法在 308 nm 处确定。在 10.005 和 10.205 eV 处测得的横截面分别为 7.5 ± 1.9 和 8.1 ± 1.9 MB。通过 2-氯乙醇的热解记录了乙烯醇的较高信噪比光电离光谱，并缩放到使用 Norrish II 型方法测量的绝对横截面。通过将我们的光谱与先前报道的光电子光谱进行比较，我们得出结论，乙烯醇主要通过在 9-9.6 eV 能量范围内的直接电离进行电离，而自电离是导致弗兰克结束以上光电离光谱稳定上升的原因– 9.9 eV 的 Condon 信封。