RELATIVE PHOTOIONIZATION CROSS-SECTION STUDY OF OH AND OD FROM 68 NM TO 95 NM

The photoionization spectra of OH and OD have been reported from 680 to 950 Angstrom (18.23 to 13.05 eV) at a wavelength resolution of 0.07 Angstrom. Through interpretation of both spectra, the Rydberg series and their higher vibrational members have been reported for three of the excited ionic states, a (1) Delta, A (3) Pi(i), and b (1) Sigma(+). A vibrational progression has also been observed in both OH and OD which is apparently related to a fourth excited ionic state, c (1) Pi. Finally, the dissociative ionization limits, corrected to 0 K, for H2O and D2O have been measured to be 18.11 +/- 0.01 and 18.21 +/- 0.01 eV, respectively, and shown to be in good agreement with previously reported results.