Water VUV electronic state spectroscopy by synchrotron radiation

Electronic state spectroscopy of water has been studied using synchrotron radiation. The spectra presented in this Letter represent the highest resolution (∼0.075 nm) measurements in the energy range 6.0-11.0 eV and have allowed a detailed analysis of several new vibrational progressions to be observed in the 8.5-10 eV region and enabled us to assign the Rydberg series in the 9.9-10.8 eV energy absorption for the first time. Absolute cross-sections are also reported and compared with the previous data.