Abstract：Experimental determinations and theoretic calculations are respectively carried out on the field ionization thresholds at various Rydberg states of atom Sr 5snd1D2(n=22～27),｜m｜=0,1,2.Any possible impact upon field ionization made by such factors as Stark shift of energy level in the process of field ionization, adiabatic or diabatic passage of ionization and environmental thermal radiation is discussed.
邱济真，郦菁. Sr原子5snd1D?Rydberg态的多重电离阈[J]. 浙江大学学报（理学版）, 1999, 26(2): 42-45.
QIU Ji-zhen,LI Jing . Field Ionization Multiple Thresholds for 5snd1D2 Rydberg States of Atom Sr.. Journal of ZheJIang University(Science Edition), 1999, 26(2): 42-45.