Photoionization and threshold photoelectron-photoion coincidence study of allene from onset to 20 eV |
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| Affiliation: | 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 photoionization efficiency curves for allene and its fragments C3H3+, C3H2+ and C3H+ are given from threshold to 20 eV. The threshold photoelectron spectra and breakdown curves are given over the same energy span. The adiabatic ionization potential is determined to be 9.69 ±0.01 eV and the heats of formation of the fragments are derived from the appearance potentials. Autoionization is found to be an important factor in the parent ionization and fragmentation. |
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