The n s Rydberg series of 1,3-trans-butadiene observed using multiphoton ionization

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Abstract
The ns Rydberg series of 1,3‐trans‐butadiene has been observed in a diffusion flame environment using two‐photon resonant multiphoton ionization in the 330–269 nm wavelength region. An analysis of the energies for the n=4 to n=12 states yields a series limit of 73 170±23 cm−1 and a quantum defect of 0.91±0.07. This ns series limit has been averaged with the limits of three other Rydberg series to give an ionization potential of 73 154±30 cm−1. The 3s and 4s states show substantial effects of mixing with the core orbitals.