Analysis of UTA Spectra of Nd∶YAG Pulse Laser Produced Mo Plasmas
WU Tao1, HE Jun1, WANG Shi-fang2, TANG Chao-hong1
1. School of Science, Wuhan Institute of Technology, Wuhan 430074, China
2. Department of Physics and Mechanical & Electrical Engineering, Hubei University of Education, Wuhan 430205, China
Abstract：The high purity molybdenum (Mo) sample were irradiated with the Nd∶YAG pulse laser to generate plasmas in a vacuum chamber. The time integrated emission spectroscopy of laser produced Mo plasmas was measured in the spectral range of 2~9 nm using different laser power density. Based on collision-radiative model (CRM) and unresolved transition arrays (UTA) data of highly charged Mo ions calculated with Cowan code, the theoretical synthetic spectra at different electron temperature and electron density were obtained assuming individual spectral line obeyed Gaussian broadening. Fair agreements between simulated and experimental spectra have been achieved. Experimental and theoretical spectra show that the UTAs of 3d—4f transitions in Mo ⅩⅥ-ⅩⅫ ions have several peaks lying in water window region. By controlling the laser pulse parameters and optimizing the plasmas confinement conditions, it is expected to obtain high ion fraction of highly charged Mo ions irradiating photons in water window wavelength region, showing the potential for water window living cell microscopic imaging sources in the future.
Key words：Laser produced plasmas；Water window sources；UTA；Molybdenum
吴 涛，何 俊，王世芳，汤朝红. 脉冲Nd∶YAG激光诱导钼等离子体UTA辐射特性研究[J]. 光谱学与光谱分析, 2018, 38(03): 692-696.
WU Tao, HE Jun, WANG Shi-fang, TANG Chao-hong. Analysis of UTA Spectra of Nd∶YAG Pulse Laser Produced Mo Plasmas. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(03): 692-696.
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