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Abstract:
The k3π state of the CO molecule is investigated in the region between 91 000 and 97 000 cm−1 via 1+1 resonance enhanced multiphoton ionization spectroscopy on CO molecules prepared in a single quantum level of the a3π(v=1) state. A new vibronic band is found which is at lower energy than the vibrational ground state reported in the literature, leading to a reassignment of the vibrational numbering of the k3π state. The rotationally resolved spectra of the k3π (v=0–6)←a3π(v=1, J=1, Ω=1) of 12CO and 13CO have been observed and analyzed, confirming the new vibrational labeling and providing a full set of molecular constants of the k3π valence state.