High Rydberg states of DABCO: Spectroscopy, ionization potential, and 
comparison with mass analyzed threshold ionization

Boogaarts, Maarten G. H.; Holleman, Iwan; Jongma, Rienk T.; Parker, David H.; Meijer, Gerard; Even, Uzi

doi:10.1063/1.471186

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High Rydberg states of DABCO: Spectroscopy, ionization potential, and comparison with mass analyzed threshold ionization

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Boogaarts, M. G. H., Holleman, I., Jongma, R. T., Parker, D. H., Meijer, G., & Even, U. (1996). High Rydberg states of DABCO: Spectroscopy, ionization potential, and comparison with mass analyzed threshold ionization. The Journal of Chemical Physics, 104(12), 4357-4364. doi:10.1063/1.471186.

Cite as: https://hdl.handle.net/21.11116/0000-000C-1560-0

Abstract

Doubly‐resonant excitation/vibrational autoionization is used to accurately determine the ionization potential (IP) of the highly symmetric caged amine 1,4 diazabicyclo[2,2,2]octane (DABCO). The IP of DABCO excited with one quantum of the ν₂₄(e′) vibration lies at (59 048.62±0.03) cm⁻¹, based on fitting 56 components of the np_xyRydberg series (δ=0.406±0.002) to the Rydberg formula. Rydberg state transition energies and linewidths are determined using standard calibration and linefitting techniques. The IP determined from Rydberg state extrapolation is compared with that determined by mass analyzed threshold ionization (MATI). Effects of static electric fields on MATI signals measured for the high Rydberg states are discussed.