Abstract
Resonance-enhanced multiphoton ionization (REMPI) has been applied to detect the hot bands as well as the cold bands of the 1a 2 →→ 3d xy ( 1A 1) Rydberg transition of furan (jet-cooled, mass-analyzed). Based on the unambiguous assignment of the hot bands, a complete vibronic analysis is given for the cold bands of this transition (up to 4600 cm −1 above the origin). This analysis can be used for the interpretation of the vibrational structure in the X ˜ 2A 2 photoelectron band. The energy ordering of the five 3d Rydberg states is 1A 2 ≈ 2A 2 < A 1 < B 1 < B 2. It is also shown that neutral CH is produced in the UV laser multiphoton photodecomposition of furan.
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