Laboratory measurements of the relative absorption cross-sections of H2O at the temperature 295 K have been made throughout the wavelength region 181–199 nm. Laboratory measurements of the absolute absorption cross-sections of H2O at 295 K have been made at 15 different wavelengths, and these absolute values have been used to put the relative cross-section measurements of H2O at 295 K on an absolute basis, In combination with our previous measurements [Chem. Phys. 211 (1996) 387; 215 (1997) 429], the absorption cross-section of H2O are available in the wavelength region 118–199 nm at 295 K.
Chemical Physics publishes experimental and theoretical papers on all aspects of chemical physics. In this journal, experiments are related to theory, and in turn theoretical papers are related to present or future experiments. Subjects covered include: spectroscopy and molecular structure, interacting systems, relaxation phenomena, biological systems, materials, fundamental problems in molecular reactivity, molecular quantum theory and statistical mechanics. Computational chemistry studies of routine character are not appropriate for this journal. In addition to regular research papers, Chemical Physics publishes invited perspectives articles (called ChemPhys Perspectives) and Special Thematic Issues. Each Chemical Physics Special Issue provides a snapshot of the leading edge in current research of a particular field in chemical physics, and contains invited articles by specialists in that field. While they are not meant to be reviews as such, the Special Issues should provide easy access to the relevant literature. The objective is to create a collection of articles representative of the newest findings in a field and equivalent to that covered at a topical conference. Guest editors or their designates are encouraged to write a ChemPhys Perspective on the subject of their Special Issue.
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The electronic excitation spectrum and the associated absolute optical oscillator strengths for the photoabsorption of water have been determined in the energy region 6–200 eV using low resolution dipole (e, e) spectroscopy and TRK sum-rule normalization. In addition, detailed studies of the absolute photoabsorption oscillator strengths for the valence shell discrete electronic transitions of water have been made using high resolution dipole (e, e) spectroscopy (0.048 eV fwhm), from the first excitation threshold up to 30 eV. The present results are free of “line saturation” (i.e. bandwidth/linewidth interaction) effects which can lead to serious errors when absolute intensity measurements are made using conventional Beer-Lambert law photoabsorption methods.
