Symmetric fragmentation of polyatomic molecular ions in ultrashort intense laser pulses |
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| Affiliation: | 1. CCAST World Laboratory, P.O. Box 8730, Beijing 100080, China;2. Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Science, P.O. Box 800-211, Shanghai 201800, China;1. Universidad de Málaga, Departamento de Química Inorgánica, 29071 Málaga, Spain;2. Universidad de Málaga, Departamento de Física Aplicada I, Laboratorio de Materiales y Superficie, 29071 Málaga, Spain;1. Key Laboratory for Laser Plasmas (Ministry of Education) and School of Physics and Astronomy, Collaborative Innovation Center for IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China;2. CAS Center for Excellence in Ultra-intense Laser Science, Shanghai 201800, China;1. School of Mathematics and Statistics, Wuhan University, Wuhan 430072, China;2. DICATAM, Mathematical Division, University of Brescia, Via Valotti 9, 25133 Brescia, Italy |
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| Abstract: | The intense field-ionization behavior of linear homonuclear polyatomic molecular ions has been numerically investigated for different molecular configurations. The enhanced ionization effect of molecular ions is found as a general feature in a critical bond length range, but the enhancement degree of ionization is bond-selective. The more symmetric the molecular ion stretches, the more enhanced the ionization of the molecular ion. It implies that the symmetric fragmentation of linear molecular ions is most probable at moderate laser intensity. These results are explained in terms of the field-induced over-barrier ionization mechanism. |
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