Radiative Collisions between Electronic and Molecular Beams : I. Angular Momentum Distribution among OH^* Radicals resulting from H_2O Molecules

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The angular momentum distributions among the OH^* radicals in radiative collisions between electronic and water molecular beams in the vacuum of 1×10^<-4>mmHg lead to several predictions as regards the mechanism of the radiative decomposition of H_2O as follows. (1) The relative number of the abnormally rotating OH^* radicals to the thermally rotating ones, both coming out of water molecules excited by electron-impacts, is on the average 10 to 1. (2) Two different kinds of singlet excited states of water molecules play leading parts in the radiative collisions; one is caused by the excitation of the oxygen (2p) electron up to the (3s) orbital, and the other by the simultaneous excitations of the oxygen (2p) and the hydrogen (1s) electrons up to their respective orbitals with higher principal quantum numbers. (3) The abnormally rotating OH^* radicals result from the former and the thermally rotating ones from the latter. (4) The recoiling H atom flies off nearly in the direction of the H-H repulsion with the highest probability.
社団法人日本物理学会の論文
1956-11-05