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Chemical Physics Letters, Vol.360, No.3-4, 406-413, 2002
Photoionization of DABCO via high vibrational levels of the S-1 state
The photoelectron spectrum following resonant two-photon ionization of 1,4-diazabicyclo[2.2.2]octane (DABCO) was recorded with the laser tuned to the origin band of the S-2 --> S-0 transition. The spectrum is consistent with the rapid radiationless transition from the S-2 state into high vibrational levels of the S-1 state, its proposed by Smith et al. [J. Phys. Chem. 88 (1984) 2250]. Features in the double-resonance spectrum of Smith et al. that were previously assigned to photoionization of S(-) 3s(-) (1)A"(2) vibrational levels populated by it radiationless transition from the S-2 state are reinterpreted. with the conclusion that the S(-) state has yet to be observed. (C) 2002 Published by Elsevier Science B.V.