A study of the Rydberg states of furan (C4H4O) and deuterated furan (C4D4O) using mass-resolved (2 + 1) and (3 + 1) resonance enhanced multiphoton ionization

Literature Information

Publication Date 2004-10-08
DOI 10.1039/B411687A
Impact Factor 3.676
Authors

Trevor Ridley, Kenneth P. Lawley, Robert J. Donovan


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Abstract

A combination of (i) two- and three-photon resonance enhanced multiphoton ionization techniques with linear and circular polarization, (ii) a comparison with the single-photon absorption spectrum and (iii) isotopic substitution has been used to study the Rydberg states of furan (C4H4O). The three X[2A2]c;3p states have been unambiguously assigned from the identification of the promoting modes involved in the strong false origins observed in the two-photon spectrum. The frequencies of the A1 vibrational modes of the ion-core that are Franck–Condon active are reported. The l values of the higher Rydberg states are assigned from their quantum defects and a comparison of the single-, two- and three-photon spectra, up to the ionization limit, reveals a strong propensity for excitation of d series with two photons and p and f series with one and three photons.

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