Combined infrared and ultraviolet-visible spectroscopy matrix-isolated carbon vapor

Infrared and UV‐visible absorption spectra have been measured on the same sample of matrix‐isolated carbon vapor in order to establish correlations between absorption intensities of vibrational and electronic transitions as a function of sample annealing. A high degree of correlation has been found between the IR feature at 1998 cm−1 recently assigned to C8 and a UV absorption feature at about 3100 A. Thus, for the first time, direct evidence is given for the assignment of one of the unknown UV‐visible features of the long‐studied matrix‐isolated carbon vapor spectrum.

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