Application of electric field ionization method to detect the high-lying Rydberg states of Eu I  

作　　者：谢军 戴长建 李鸣 

机构地区：[1]Key Laboratory of Display Materials and Photoelectric Devices,Ministry of Education [2]School of Science,Tianjin University of Technology

出　　处：《Chinese Optics Letters》2011年第5期5-7,共3页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 10674102);the Natural Science Foundation of Tianjin (No.05YFJMJC05200)

摘　　要：The 4f^76s（~9S）np 8 P J （J = 5/2, 7/2, 9/2） Rydberg series converging to the first ionization limit 4f 7 6s 9 S 4 of the Eu atom using the three-step laser excitation and electric-field-ionization （EFI） method are studied. First, the Eu atom is excited from the 4f 7 6s 2 8 S o 7/2 ground state to the 4f 7 6s7s 8 S o 7/2 state through the 4f 7 6s6p 10 P 9/2 state by the first two dye lasers. Next, it is populated to many higher-n members of the 4f 7 6s（ 9 S）np 8 P J Rydberg series by the third dye laser whose wavelength is scanned within a certain range. Finally, the atom in these higher-n states is ionized by the external pulsed electric field. With the field strength up to 2 kV/cm, we can detect the atom in 4f 7 6s（ 9 S）np 8 P J states with n 40. With the given laser line width, the level energies of Rydberg states with n as high as 72 can be determined. We not only confirm the previous data on the 4f 7 6s（ 9 S） np 8 P J Rydberg series, but also extend the n-value assignment significantly by detecting more states.The 4f^76s（~9S）np 8 P J （J = 5/2, 7/2, 9/2） Rydberg series converging to the first ionization limit 4f 7 6s 9 S 4 of the Eu atom using the three-step laser excitation and electric-field-ionization （EFI） method are studied. First, the Eu atom is excited from the 4f 7 6s 2 8 S o 7/2 ground state to the 4f 7 6s7s 8 S o 7/2 state through the 4f 7 6s6p 10 P 9/2 state by the first two dye lasers. Next, it is populated to many higher-n members of the 4f 7 6s（ 9 S）np 8 P J Rydberg series by the third dye laser whose wavelength is scanned within a certain range. Finally, the atom in these higher-n states is ionized by the external pulsed electric field. With the field strength up to 2 kV/cm, we can detect the atom in 4f 7 6s（ 9 S）np 8 P J states with n 40. With the given laser line width, the level energies of Rydberg states with n as high as 72 can be determined. We not only confirm the previous data on the 4f 7 6s（ 9 S） np 8 P J Rydberg series, but also extend the n-value assignment significantly by detecting more states.

关 键 词：ATOMS Dye lasers Electric excitation Electric fields EUROPIUM IONIZATION Laser excitation 

分 类 号：O562.3[理学—原子与分子物理]