The information contents of the HeI photoelectron spectroscopy (PES) are emphasized first. The second band of the PE spectrum of the NO3 radical is attributed to electron ionization of the 1e″ orbital leading to the triplet state 3E″ of the NO3+ cation, and it is never corresponding to the excited state of the NO3 cation. A nonoverlapping between the second PES band of NO3 radical and the PES band centered on 13.02 eV for the NO2 is clearly seen from expanded PE spectrum recorded by the pyrolysis of pure N2O5. So a best PE spectrum of the NO3 radical was recorded by us until now.

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© 1998 American Institute of Physics.
1998
American Institute of Physics