FIG. 4. Simulated~dashed line! and experimental~solid line! first band of the ClO2 He I PE spectrum. The theoretical second-order anharmonic spectrum is obtained by us using the PEF calculated by Peterson and Werner~Refs. 46 and 47! and the experimental geometry for ClO2 ~Refs. 51 and 52! and RCl–O 51.411 Å anduO–Cl–O5121.80° as geometrical parameters for the cation.
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