Excitation of the K2 molecule by the 406.7 nm and 413.1 nm Kr+ laser lines

Two blue lines (406.7 nm and 413.1 nm) of a Kr+ laser have been used to excite the potassium dimer K2. It has been analysed the spectral region between 400 nm and 800 nm where a rich fluorescence spectrum has been observed as the result of different decay processes. Some of these features have not been reported previously; in particular it is interpreted the blue fluorescence( ∼ (400-470)nm) as due to the C → X and D →X bands, as indicated also by the absorption spectra recorder in this region for different temperatures