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Complete molecular valence-electron spectra were measured for CO. Unexpectedly, discrete lines at low kinetic energies were found, superimposed on a continuous energy spectrum representing direct double-ionization processes. The appearance of these lines is discussed in the context of the formation

The relative transition probabilities at threshold for the photoemission of molecular nitrogen to vibrational levels of the Xe!.i). Aen u ). and Be!.n states of the Nt ion have been determined with high resolution threshold photoelectron spectroscopy using synchrotron radiation. These threshold cross sections are found to be strongly influenced by ionizing Rydberg states which are not necessarily apparent in the absorption or photoion spectrum of nitrogen. This interaction leads in the Xe!.;) state of Nt to rotationlike structure in the observed vibrational transitions and in the A erru) state to a smooth but non·Franck-Condon distribution of vibrational intensities. In addition to the cross section data. the molecular parameters for the X. A. and B states of N2 have been determined.