Quenching of Na resonance radiation; collisions of excited sodium with atoms,molecules and electrons in the ICP |
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| Affiliation: | 1. Department of Radiation Oncology, Miami Cancer Institute, 8900 North Kendall Drive, Miami, FL 33176, USA;2. Department of Radiation Oncology, Moffitt Cancer Center, 12902 USF Magnolia Drive, Tampa, FL 33612, USA;3. Department of Radiation Oncology, Dana-Farber Cancer Institute, 450 Brookline Avenue, Boston, MA 02215, USA;4. Department of Radiation Oncology, University of Iowa, 200 Hawkins Dr, Iowa City, IA 52242, USA;5. Department of Radiation Oncology, University of California Los Angeles, 1338 S Hope Street, Los Angeles, CA 90015, USA;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China;2. Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China;1. Politecnico di BARI, Department of Mechanics, Mathematics and Management, Via Orabona 4, 70125 Bari, Italy;2. Hamburg University of Technology, Department of Mechanical Engineering, Am Schwarzenberg-Campus 1, 21073 Hamburg, Germany;3. Imperial College London, Department of Mechanical Engineering, Exhibition Road, London SW7 2AZ, UK;1. Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong Special Administrative Region;2. Department of Neuroscience, City University of Hong Kong, Hong Kong Special Administrative Region;3. Centre for Regenerative Medicine and Health, Hong Kong Institute of Science and Innovation-CAS Limited, Hong Kong Special Administrative Region;1. Department of Psychology, City University London, London, UK;2. MRC Social, Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Psychology, and Neuroscience, King''s College London, University of London, London, UK;3. Division of Psychology and Language Sciences, University College London, University of London, London, UK;4. Institute of Cognitive Neuroscience, University College London, University of London, London, UK |
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| Abstract: | Spatial distributions of Na resonance level lifetimes in the inductively coupled plasma (ICP) are measured by time-resolved laser-excited fluorimetry. In order to elucidate the quenching mechanism, the lifetimes obtained are compared to theoretical values estimated from the quenching rate coefficients and number densities of colliding species. As a result, it is shown that resonance level Na atoms are mainly deactivated by electrons at lower heights in the plasma, while collisions with nitrogen molecules entrained from the surrounding atmosphere dominated the quenching reaction in the tail flame region. |
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