Vibrational Overtone Spectroscopy of Cycloheptatriene-d₆ at the Third and Fourth Overtone Regions

The ground electronic state of 1,2-dichloroethane II. Experimental investigation of the fundamental and overtone vibrations

“…As is typical in high overtone spectra of larger molecules, a normal mode analysis is less adequate for understanding the vibrational pattern, and the rotational band contours cannot be determined from the experimental evidence. We attempted to use a local mode analysis on the high overtone data similar to the analysis which we have undertaken for cycloheptatriene [8] and butadiene [15], with the hope of providing assignments for the second overtone data matching those from the normal mode analysis. Unfortunately, the two interpretations were too dissimilar, and not even able to agree on the trans or gauche origin of the peaks.…”