Tropyl (cyclo-$C_{7}H_{7}$) Radical Electronic States observed by Resonance Enhanced Multiphoton Ionization Spectroscopy
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Date
1991
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Ohio State University
Abstract
Two-photon electronic absorption spectra of the tropyl radical (cyclic $C_{7}H_{7}$) have been observed by Resonance Enhanced Multiphoton Ionization Spectroscopy (REMPI) from 415 to 590 nm, corresponding to 34000 to 48000 $cm^{-1}$. Two Rydberg series are assigned and an ionization potential determined: $n$p, $\delta=0.35$; $n$f, $\delta=0.05$; $IP=50177$ $cm^{-1}$. Vibrational activity of the Rydberg states was observed and the frequencies were found to be similar to the ion: $\omega_{2} = 862 cm^{-1}$ (ring breathing), $2\omega_{18} = 1528 cm^{-1}$ (ring bending), and $2\omega_{20} = 1284 cm^{-1}$ (CH out-of-plane bend).
Description
Author Institution: National Institute of Standards and Technology Chemical Kinetics and Thermodynamics Division Gaithersburg