Near-resonance effects in the laser induced ionization of strontium in the air-acetylene flame |
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| Institution: | 1. São Carlos Institute of Physics, University of São Paulo, São Carlos, SP, Brazil;2. Institute of Semiconductor Technology and Laboratory for Emerging Nanometrology LENA, Technische Universität Braunschweig, Braunschweig, Germany;3. Laboratório de Espectroscopia Óptica e Fotônica, Universidade Federal de Alfenas, Poços de Caldas, MG, Brazil;4. Departamento de Fisica, Universidad Popular del Cesar, Barrio Sabana, 2000004, Valledupar, Cesar, Colombia;1. Research and Development Directorate, Japan Aerospace Exploration Agency, Tsukuba, Ibaraki, 305-8505, Japan;2. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Tsukuba, Ibaraki, 305-8505, Japan;3. Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ, 08544, USA |
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| Abstract: | Several ionization signals observed for strontium atoms in an air-acetylene flame when a single, pulsed dye laser is focussed into it are attributed to near-resonance two-step excitation followed by collisional ionization with flame species. These signals are clearly different from those obtained at exact single-photon or two-photon resonances. Other possible excitation-ionization mechanisms are also discussed. |
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