The study of HeI photoelectron spectroscopy (PES) of the electronic structure for CIONO2

The HeI photoelectron spectroscopy of chlorine nitrate (CIONO2) is reported. The assignment of the HeI spectrum has been made using bandshape and vibrational structures of the bands, as well as GAUSSIAN 86 ab initio SCF MO calculations. The vibrational spacings of three bands in the low ionization potential region (< 13.50 eV) are respectively: 1246 ± 60 cm−1 for the first band, 770 ± 50 cm−1 for the second band and 545 ± 50 cm−1 for the third band.