Abstract
The cross sections for the emission of two photons of N fluorescence in photoexcitation of N2, differential with respect to each solid angle for the two photons, have been measured as a function of incident photon energy in the range of 28–49 eV to investigate the multiply excited states of N2. The resonance peaks attributed to the neutral excited states of N2 have been found at 36, 39, 40–44 and 45 eV in the ionization-free fluorescence cross section curve. It has turned out that these neutral excited states are multiply excited states of N2. It is remarkable that the multiply excited state of N2 at 45 eV embedded in the double ionization continuum makes a contribution comparable to those below the double ionization potential in the ionization-free cross section curve.
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