Chemical Physics

Abstract

Dipole oscillator strengths (cross sections) for the photoabsorption, partial and total photoionisation and photofragmentation of H2O have been obtained, over a range up to an equivalent photon energy of 60 eV, using electron-impact coincidence simulation techniques. The results are quantitatively equivalent to those that would be obtainable by photoelectron spectroscopy and photoionisation mass spectrometry with continuously tuneable light sources. The photoionisation efficiency is also reported. The results of the two experiments are combined to provide a quantitative picture of the dipole induced breakdown of H2O in the region up to 60 eV.