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A precise determination of the first ionization potential of benzene

✍ Scribed by S.C. Grubb; R.L. Whetten; A.C. Albrecht; E.R. Grant

Publisher: Elsevier Science
Year: 1984
Tongue: English
Weight: 496 KB
Volume: 108
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(84)85171-4

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✦ Synopsis

The first ionization potentials of benzene and benzeneil6 have been precisely determined by the extrapolation of three-photon resonant Rydberg states in the four-phoron ionization spectrum of the jet-cooled molecule. The convergence of resoived transitions in two Rydberg series for principal quantum numbers as high as 14 (-lrd and 15 (46) establish adiabatic thresholds of 74573.0 + 2.0 cm-' and 74592.5 I 1.2 cm-', respectively. These results arc crucial for the understxtding of the many excited states of benzene in terms of quantum defect theory. Precise quantum defects have been obtained for seveml Rydbeg series and their variation with principal quantum number is reported.

The results strongly supgest that the 11"' scrics of Wil!&xon is derived front a n(et,) -nfkt Rydberg excitation.

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