We performed two-color resonance ionization spectroscopy to study the highly excited states of hafnium. We obtained the high-resolution spectra of the Rydberg series converging to the first ionization limit. These series of states have not been previously observed. From analyses of the main Rydberg series with Rydberg formula, we derived the ionization potential of hafnium as 55047.9 +/- 0.1 cm(-1). Comparing the spectra obtained through three different intermediate states, we could assign the J value of all the series in a certain energy region.
展开▼
