Photoelectron spectroscopy of the NO dimer

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Abstract
He i photoelectron spectra are presented for the NO dimer, (NO)2, and for a mixture of higher clusters, (NO)nn≥3. The NO dimer shows a weak second band associated with a shake-up transition at a vertical I.E. of 10.8 eV, 1.9 eV above that of the first band. This disagrees with a theoretical estimate of 2.7 eV. The ratio of intensities of these two bands is measured as 1:0.18 in comparison with the theoretical estimate of 1:0.28. The spectrum of the mixture of higher clusters shows the analogous two bands at vertical I.E.s of 8.4 and 10.8 eV, respectively. The band separation of 2.4 eV is close to the value of 2.6 eV observed in the photoemission spectrum of condensed NO.