Martin expression about the quantum defect of single-valence atoms is extended to many-valence atoms by identifying the ......

We present high resolution photoelectron energy spectra from multiphoton ionization (MPI) of Ar subject to laser pulses ......

The 4f7 6s(9S)np 8PJ (J=5/2, 7/2, 9/2) Rydberg series converging to the first ionization limit 4f7 6s 9S4 of the Eu atom......

Considering the perturbation, the results of theoretical calculation of five Rydberg series energy levels 6s2ns2S1/2(n=......