Abstract
The OH(A–X) and OD(A–X) emission spectra have been measured by 17 eV electron impact on the mixtures of H2O and D2O with several mixing ratios. The intensity ratio of the OH(A–X) emission to that of OD(A–X), q, in the spectra of the mixture has been estimated using the OH(A–X) and OD(A–X) spectra obtained from pure H2O and pure D2O. As a result, q is proportional to the ratio of the H-atom quantity to the D atom in the mixture, indicating that q is independent of the fraction of HOD in the mixture. The following emission intensity ratios are obtained. σHOD→OH/σHOD→OD=σH2O→OH/σD2O→OD=0.53±0.02,σD2O→OD/σHOD→OD=1.88±0.24, where σHOD→OH means the total emission cross section of OH(A–X) by electron impact on pure HOD, and the others are similar.
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