Determination of unimolecular ionic formation rates by pulsed laser-linear reflectron time-of-flight mass spectrometry |
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| Affiliation: | 1. Shenzhen Key Laboratory of Marine Bioresource and Eco-environmental Science, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen 518060, China;2. College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China;3. BNU-HKUST Laboratory of Green Innovation, Advanced Institute of Natural Sciences, Beijing Normal University at Zhuhai, Tangjiawan, Zhuhai, Guangdong, China;4. Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation and College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China;5. School of Science and the Environment, Grenfell Campus, Memorial University of Newfoundland and Labrador, Corner Brook A2H 5G4, Newfoundland, Canada;6. Key Laboratory of Plant-Soil Interactions, Ministry of Education, China Agricultural University, 100193 Beijing, China;7. School of Agriculture, Sun Yat-Sen University, Shenzhen, Guangdong 518107, China;8. Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Key Laboratory of Crop Cultivation and Physiology of Jiangsu Province, College of Agriculture, Yangzhou University, Yangzhou 225009, China;9. Department of Medical Cell Biology and Genetics, Health Science Center, Shenzhen University, Shenzhen 518060, China;10. PEIE Research Chair for the Development of Industrial Estates and Free Zones, Center for Environmental Studies and Research, Sultan Qaboos University, Al-Khoud 123, Muscat, Oman;11. Department of Horticulture, Faculty of Agriculture, University of Maragheh, Maragheh 83111-55181, Iran;12. Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;13. Connecticut Agricultural Experiment Station, New Haven, CT 06511, USA;1. CCNH, Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, UFABC, Avenida dos Estados 5001, Bloco B, Santo André, São Paulo 09210-580, Brazil;2. Faculdade de Tecnologia (Fatec) de Santo André, Rua Prefeito Justino Paixão 150, Santo André, São Paulo 09020-130, Brazil;3. Faculdade de Tecnologia (Fatec) de Diadema – Luigi Papaiz, Avenida Luiz Merenda 443, Diadema, São Paulo, 09931-390, Brazil;4. Laboratório de Processos Metalúrgicos, Instituto de Pesquisas Tecnológicas do Estado de São Paulo (IPT), Avenida Prof. Almeida Prado, 532, Prédio 2, São Paulo 05508-901, Brazil;5. CENA, Centro de Engenharia Nuclear na Agricultura, Universidade de São Paulo, Avenida Centenário 303, Piracicaba, São Paulo 13416-000, Brazil;6. Departamento de Química, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Belo Horizonte, Minas Gerais 31270-901, Brazil |
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| Abstract: | The study of fragment-ion signals as a function of delay time between the laser pulse and the pulsed extraction electric field in a linear reflectron offers a new technique for the determination of the formation rates of some of these fragments. It is shown that this technique has better time resolution, higher sensitivity, and more versatility than previous methods. The formation rates of seven daughter ions resulting from laser multiphoton ionization dissociation (MPID) of 1,4-dichlorobenzene are determined. The formation rate of C6H4C1+ at high laser intensities is comparable to that determined using one 14 eV photon. This suggests that its formation by MPID at high UV intensity involves the three-UV-photon level (at 14.0 eV) via a ladder mechanism. |
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