Band Shapes of the Electronic Spectra of Complex Molecules

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Abstract
Structureless bands of ultraviolet absorption spectra of hydroxypyridine derivatives in solution have been examined. It is shown that the log–normal distribution provides a convenient four-parameter empirical description of the bands and gives a much better fit than the two half-width Gaussian. The log–normal yields a resolution of overlapping bands by a method of least squares that is very satisfactory. A simple configuration-coordinate model is presented that lends some physical meaning to the parameters of the log–normal. It yields normalized third and fourth moments that are near those of the log–normal.