Tensor polarizabilities of the (nd+(n+1)s)3 2 D 3/2,5/2 levels in Sc I, Y I, La I and Lu I

Abstract

A technique based on the detection of nonlinear level-crossing resonances in parallel electric and magnetic fields has been extended to the study of the Stark splittings in the hyperfine levels of the ground multiplets (nd+(n+1)s)32D3/2,5/2 in Sc I, Y I, La I, and Lu I. Values of the tensor polarizabilities of thend electrons were evaluated from the experimental results. The variation of the tensor polarizabilities of thend electrons in the configurations under study is discussed. Trends of the polarizabilities in different configurations are compared. The ratio between the electric quadrupole constant and the tensor polarizabilities is constant in La and different in Lu, which is caused by a breakdown of the central field model.