A New Laser Photochemical Process for Isotope Enrichment |
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Authors: | C T Lin |
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Institution: | Instituto de Química and Institutto de Física “Gleb Wataghin” Universidade Estadual de Campinas , 13100, Campinas, SP, BRASIL |
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Abstract: | Selective laser excitation of a specific isotopic species to its lowest electronic singlet (S1) and triplet (T1) states respectively, then followed by a chemical reaction for isotope separation is examined theoretically. It is found that the direct excitation to T1 state from ground state (S0) is an unique excitation channel for obtaining a controllable chemical reaction and for achieving a high isotope separation factor. This is due to the following important facts: 1) Resonant energy transfer from a selectively excited triplet isotopic species to an unexcited species of the other isotope present in the mixture is missing (or is very small); 2) The lifetime of the T1 state is normally longer than that of the S1 state; 3) There is no intersystem crossing channel that exists for the deactivation of excited isotopic species from T1 state. Numerical calculation is performed for the chlorine isotope separation in a mixture of thiophosgene (0.5 torr) and diethoxyethylene (1.5 torr). The result indicates that the isotopic enrichment factor is at least 2.5 × 103 times larger for selective T1 excitation than that for S1 excitation. |
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