R. Lindner et al., THE DYNAMIC JAHN-TELLER EFFECT IN THE BENZENE CATION - ROTATIONALLY RESOLVED ZEKE PHOTOELECTRON-SPECTRA OF THE NU-6(E2G) MODE, Angewandte Chemie, International Edition in English, 32(9), 1993, pp. 1364-1366
A textbook example of the dynamic Jahn-Teller effect is provided by th
e Jahn-Teller components of the nu6 mode of the benzene cation. They w
ere resolved to the rotational level for the first time by zero kineti
c energy (ZEKE) photoelectron spectroscopy. The picture on the right s
hows the ZEKE spectrum of the 6(1) (j= +/- 1/2) band of the electronic
ground state of the benzene cation via the intermediate state S1 6(1)
(J' = 1, K' = 1, + l).