Zitat des Tages von Gerhard Herzberg:
For polyatomic free radicals and ions, one is dependent both for the ground states and the excited states on the study of electronic spectra to obtain the shapes and the geometrical parameters.
If you start from nothing, it is very difficult to get anywhere.
I was brought up as a physicist.
The visible and near-ultraviolet emission spectrum of the CH radical has been known ever since spectra of an ordinary Bunsen burner have been taken.