Absolute measurement of photoionization cross-sections of excited states 3s5s¹S and 3s4d¹D in magnesium

Abstract

We report the first experimental investigation of the photoionization cross-sec-tions of singlet excited ststes 3858's and 3s4d'D in atomic magnesium, which can not be directly reached from the ground state. The measured absohte values are us.5.1S (571.lnm)=(0.27fO.O9)Mb and (TJs#D (552.8nm)=(2.6fO.9)Mb. Theoretical calculations were given, which are in good agreement with the measured values.