Multichannel processes of H2O in the 18 ev region

Abstract

The various absolute partial cross sections for producing the excited neutral fragments, OH(A 2Σ+), H(n = 2-4), and H 2(a 3Σg+), from photoexcitation of H2O in the 15-20.5 eV region are presented. It is found that a large fraction of the neutral products which amounts to 0.35 in the 15.7-17.7 eV region can be attributed to the undetected neutral products of (1) H(n = 1) + OH(X 2Π), (2) H2(Z 1Σ g+) + O(1D), and (3) H2(X 1Σg+) + O(1S). All these products will possess high kinetic energy. The present results clearly show strong competitions among processes leading to photoionization and various photodissociation processes. © 1988 American Institute of Physics.