Abstract
This work presents the three-photon resonant, one-photon (3 + 1) ionization spectrum of chlorine in the region of 73170–79360 cm −1 above the neutral ground state. In contrast to one-photon experiments, an intense double-peaked band progression attributed to 35Cl 2 and 35Cl 37Cl is observed in this energy region and assigned to a 3Σ u(υ′ = 0–7) ← X 1Σ g + (υ″ = 0) Rydberg excitation. The molecular constants of the 3Σ u Rydberg well as determined from the vibrational progression are T e = 74013 (5) cm −1, ω e = 628 (3) cm −1 and ω eχ e =4.4 (6) cm −1.
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