Autoionization widths of the NO Rydberg-valence state complex in the 11-12 eV region

• The photoion excitation spectra of 14NO and 15NO have been studied in the 105-112 nm excitation region usinghigh-order harmonic laser spectroscopy. Utilizing the small bandwidth offered by this technique, the natural widths ofprominent lines in this region have been measured. These lines originate from interactions between high-lying Rydberglevels converging to the NO + electronic ground state and a 'new' NO valence state situated close to the latter state. Thepresent measurements show broad resonances corresponding to a decay time of 20-50 fs. This supports the interpretationthat the decay takes place via rapid electronic autoionization.

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