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. Author manuscript; available in PMC: 2010 Feb 23.
Published in final edited form as: Chem Phys. 2009 Feb 23;357(1-3):4–16. doi: 10.1016/j.chemphys.2008.07.011

Fig. 10.

Fig. 10

Analysis of the 72 most important ground state modes of C18 showing the log of the coupling product (Eq. 9) in wavenumbers squared and the ratio of coupling products for the mode fundamentals with reference to the 21Ag− excited state. The ratio of the rolling sum of these terms is shown in the central part of the plot with vertical lines delineating a unit ratio of 1.0. This plot indicates that the cis configuration of C18 will invariably couple more effectively to the ground state via radiationless processes in comparison to the all-trans configuration.