Excited state absorption spectroscopy of alkaline earths selectively pumped by tunable dye lasers. I. Barium arc spectra

Abstract
Employing a high power, narrow band, frequency tunable dye laser, the 6s6p1P10 level of Ba I has been selectively excited. The excited state absorption series 6s6p1P10-6snd1D2 has been measured and extended from n=9 to n=41 and series perturbations by 1D2 levels have shown lines of the 6s6p1P10-6s(n+1)s1S0 series. Terms of the auto-ionization series 6s6p1P10-5dns1D2 have also been observed and assigned.