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The ungerade ns+nd Rydberg states of C 2 H 2 converging to the ground state of the C 2 H 2+ cation have been investigated in the energy range 74000-88000 cm -1 by (3+1)-multiphoton ionisation (REMPI) and by VUV absorption spectroscopy at the Super-ACO synchrotron radiation facility. Both methods have allowed the selective analysis of the Rydberg transitions...
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