Knowledge Bank

The utilization of a composite wall hollow cathode lamp and a Hypeac interferential spectrometer allows a far more precise study of diatomic molecular electronic spectra than with a large grating spectro-graph. From the profile of the first lines ((0-0)band of $B1\Pi \to$ $X1\Sigma$ transition of LuF), we were able to determine the quadrupolar constants of the fundamental and excited states, and the nuclear spin-electronic orbit constant a ($H_{IL} = a I \cdot $L) Then we show that the corresponding parameters allow us to calculate the slight dissymmeties observed for all the P, Q, and R lines.