The gmund state of Hafnium is 5 d W 'Fs and that of Hf I1 is 5d&' 'DSi2. This indicates that the electronic configuration of the excited states cannot be described with tw+electron system. Resonance ionization spectroscopy haa the advantsgc of the capability to inv-tigate highly excited states thmugh the specific intermediate state. RBferenee[l] observedRydberg series converging to the excited states of Hf I1 and determined the first ionization potential of Hf as 55047.9cm-' [I]. Because of the electronic configuration, the series converging to the kist ionization limit were not expected. We report that we performed two color resonance ionization spectroscopy of Hf atoms and the Rydberg series converging to the ground state of Hf I1 were identified.The experimental apparatus consists of Iaaer system, m u u m chamber and detection system. Two dye lasers (Lambda Physik FL3M2, LPD3000) pumped hy a XeCl excimer Issec (Lambda Physik LPXIlOi) were used to resonantly excite and ionize the atoms. T h e lawn dye of DMQ (346om N 375") was *men t o ionize the atoms with two photons. The wavelength was calibrated with a rare gas otptogalvano cell and a etalon.Hafnium was vaporized hy 80 eledmn beam in the vacuum chamber whose pressure was .. I O W tocr. The two laser beams intelsrted the atomic beam perpendicularly. The ionized dum8 were extracted by a pulsed electric field and detected by B ehanneltron. F i y r e 1 shows the intermediate Btates hy scanning the first step laser wavelength. The second laser wavelength was fixed a t 360nm. Among the observed transitions, 5d2686p 'FZ was chosen as the intermediate state. Figure 2 shows the spectrum obtained by Beanning the second laser wavelengh. Using the Ritz formula E = I -ll/u2(E : energy, I : ionization potential, R : Rydberg constant, Y : effective quantum number), we identified that the observed Rydberg series were converging to the first ionization limit. 111 C.L. Callendar, P.A. HseLett, and D.M. Rayner, J. Opt. Soc. Am. B5, 1341(1988) Refercnce
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