用双光子电离探测技术研究奇宇称的Sm原子光谱

采用两台激光器对Sm原子奇宇称激发态的光谱及其特性进行了系统研究.利用一台波长在585 nm到663 nm之间调谐的染料激光器，将Sm原子从某个4f⁶6s²⁷F_J(J=0—6)态激发到具有奇宇称的4f⁶6s6p或4f⁵5d6s²激发态.然后，采用波长固定在532 nm的强激光束，对处于上述奇宇称激发态的Sm原子进行双光子电离，以实现探测其光谱信息 关键词： 双光子电离 奇宇称态 Sm原子

Study of odd-parity states of Sm atom with two-photon ionization detection method

In this paper, spectra of odd-parity states of Sm atom are systematically studied with two-photon ionization detection method. The Sm atom is excited by a pulsed dye laser and scanned from 585 nm to 663 nm, so that it is populated in different odd-parity states with 4f⁶6s6p and 4f⁵5d6s² electronic configurations from one of the 4f⁶6s²⁷F_J(J=0—6) states. Then the Sm atom is further excited and ionized by a two-photon transition with a second laser which has a much higher intensity and a fixed wavelength. The Sm ions emerging from the above processes were detected by an MCP detector. Some of the transitions are reported for the first time together with their resonance wavelengths and relative strengths, while the rest of them which have been reported previously in the litcrature are confirmed by the present work with supplementary information on their relative strengths.