Electron-impact spectra of water vapor have been investigated at 400- and 500-V electron kinetic energy. The relative intensities of the five peaks associated with the A and B Rydberg transitions have been studied as a function of the scattering angle. The results suggest a new method of identification of vibrational levels where a high-resolution study of rotational structure is not feasible.
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Skerbele et al. (1966) studied this question.