Biography
Biography: Yuki Nojiri
Abstract
Zeeman and Stark eff ects, the interactions between the atom and magnetic or electric fi elds are very important for understanding the atomic structure. The fundamental spectroscopic data of the g factor and the electric polarizability are directly related to the atomic wave function and therefore, provide sensitive tests of theoretical calculations. As a heavy twoelectron atom, Ba has rather complicated atomic structure together with strong confi guration mixing in highly excited states and shows repeated interest to spectroscopists up to now. For the 5d6p confi guration, the electric polarizabilities of 3DJ and 3PJ have been reported and found to have large diff erent values. However, there are no data determined for 3FJ. Data for 3FJ are indispensable for checking the systematic behavior of the 5d6p confi guration. Recently we have measured Zeeman and Stark eff ects for 3F2. In this paper we report measurements for 3F3 and 3F4. Th e high-resolution atomic-beam laser spectroscopy was performed to measure Zeeman and Stark spectra. A tunable diode laser with an external cavity system together with a highly collimated atomic beam was used in this experiment. Laser-induced fl uorescence was measured and magnetic or electric field was applied to atomic beam. Transitions from the metastable states 6s5d 3DJ populated by an electric discharge were used. Figure 1 shows the measured spectrum at the zero fi eld for the Ba 6s5d 3D3 5d6p 3F4 transition at 705.9 nm; the peaks of 136Ba and 138Ba are marked and other peaks are the hyperfi ne structure of the odd-isotopes 135Ba and 137Ba. Th e insert in Fig. 1 is the measured Zeeman spectrum at the magnetic fi eld 186.1 G which shows splittings by the magnetic fi eld for 136Ba and 138Ba. Zeeman and Stark spectra were measured at various magnetic and electric fi elds and their shift s and splittings were derived. Therefore, the g factor and scalar and tensor polarizabilities were determined for 5d6p 3F3 and 3F4. Together with the previously reported values on 3F2, systematic behaviors of the g factor and scalar and tensor polarizabilities for 3FJ are discussed.