Femtosecond laser-induced breakdown spectroscopy of sea water |
| |
| Affiliation: | 1. Embrapa Instrumentation, Rua XV de Novembro, 1452, CEP 13560-970 São Carlos, SP, Brazil;2. Institute of Inorganic Methodologies and Plasmas, CNR, Bari, 70126 Bari, Italy;3. Physics Institute of São Carlos, University of São Paulo, IFSC-USP, Av. Trabalhador são-carlense, 400 Pq. Arnold Schimid, 13566-590 São Carlos, SP, Brazil;1. College of Physics Science, Qingdao University, Qingdao 266071, China;2. National demonstration center for experimental applied physics education, Qingdao University, Qingdao 277071, China;1. ENEA, UTAPRAD, V. E. Fermi 45, 00044 Frascati, Italy;2. ENEA,UTTAMB, SP Anguillarese 301, Roma, Italy;3. CNR-IMIP, UOS Potenza, Zona Industriale, 85050 Tito Scalo (PZ), Italy;4. Università degli Studi della Basilicata, Dipartimento di Scienze, Via dell''Ateneo Lucano 10, 85100 Potenza, Italy |
| |
| Abstract: | The composition of the line and band spectra of the plasma induced by a femtosecond laser pulse on the surface of sea water is determined. The temporal behaviors of the intensity of the continuum and the Ca II, Mg II and Na I lines are investigated. It is shown that the time dependence of the intensity of the Na I line is described by a monoexponential function. The characteristic decay times of the line intensities of Mg II and Na I were used to estimate the three-body recombination times. Using these values, we estimate the electron number density and the feasibility of Local Thermodynamic Equilibrium (LTE) criterion. A method involving excitation rate constants is proposed for the comparison of detection limits. For a plasma generated on a liquid surface, the following relation among detection limits will be obtained: LOD(Na) < LOD(K) < LOD(Ca) < LOD(Al) < LOD(Mg) < LOD(Zn). |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
