Winter Bernd, Hergenhahn Uwe, Faubel Manfred, Björneholm Olle, Hertel Ingolf V
Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Strasse 2A, D-12489 Berlin, Germany.
J Chem Phys. 2007 Sep 7;127(9):094501. doi: 10.1063/1.2770457.
We have measured resonant and off-resonant Auger-electron spectra of liquid water. Continuumlike transitions near and above the O1s vertical ionization energy are identified by the characteristic normal Auger-electron spectra. On the contrary, well-resolved spectator shifts of the main Auger-electron peak are observed at the liquid-water O1s absorption main edge and near the absorption pre-edge. The shifts of 1.4 and 1.9 eV arise from the localized nature of the excitation. Excited-state localization/delocalization is also discussed for the analogous vacuum ultraviolet (VUV) transitions, and we point out the similarities between x-ray and VUV absorption spectra of liquid water.
我们测量了液态水的共振和非共振俄歇电子能谱。在O1s垂直电离能附近及以上的类连续跃迁通过特征性的正常俄歇电子能谱得以识别。相反，在液态水O1s吸收主边缘和吸收预边缘附近观察到了主要俄歇电子峰的清晰分辨的旁观者位移。1.4和1.9电子伏特的位移源于激发的局域性质。还讨论了类似的真空紫外（VUV）跃迁的激发态局域化/离域化，并且我们指出了液态水的X射线和VUV吸收光谱之间的相似性。
