Abstract
The field ionization process of Eu 4f76 snp Rydberg states converging to the first ionization limit 4f76s9S4 was systematically investigated. Firstly,the spectra of Rydberg states 4f76 snp of Eu atom were measured using the three-step laser excitation and electric field ionization( EFI) method.Secondly,the EFI pulse( pulse width of 0. 2 μs) was applied after laser excitation. Then,we continuously scan field ionization voltage to observe the EFI process,and to realize the potential of field ionization we need to understand what happens to the atoms as the pulse field rises from 0 to 3 kV.The exact location of ionization threshold can be obtained when the peak of ionization field changes.Especially,above the threshold,some structures are found due to black body radiation( BBR).
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