Summary: This paper has made a study of ions ZrIII, CdII and AgII through spectrometry technique of laser-induced breakdown (LIBS). This has been carried out to develop a system for acquiring spectra emission of laser produced plasmas, and has obtained the spectral response of that system in the range of
1900 to 7000 A. There has been a spectroscopic study of the different plasmas empleados.De This would have given them parameters such as composition, temperature and the density of electrons and autoabsorción that presentaban.También and thanks to the parameters mentioned, it has been determined if plasmas were in balance Termodinámico Local and if they were optically thin. Have been measured experimentally transition probabilities for transitions that originate in the levels 4d5d and 4d5p of ZrIII, levels 5p, 5d, 6s, 4d95s2, 6p, 4d9s5p, 4f, 7p, 5f and 8p of CdII and levels 5 s2 and 6s3 D3 of the AgII. These experiments have been performed with oxide zicronio and alloy Zr-Cu for the case of ZrIII, pure and cadmium alloy Cd-Zn for the case of CdII and pure silver for the case of AgII.También is been calculated theoretically by relativistic Hartree - Fock method with a mixture of configurations transition probabilities and the lives of average levels above the ZrIII and CdII.
