Laser photoelectron spectroscopy is used to study NS" and CS" ions. Analysis of the photoelectron spectra yields electron affinities of 1.194 ± 0.011 and 0.205 ± 0.021 eV for the corresponding neutral molecules. Equilibrium bond lengths for the negative ions are obtained from a Franck-Condon analysis of the relative intensities of the observed transitions. The NS" spectrum shows photodetachment from several vibrational levels, allowing determination of the NS" vibrational frequency as 880 ± 70 cm"1.
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