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Within the math absorption band of CH2BrCl, we theoretically analyze the laser-induced control of the Br/Cl branching ratio, Br + CH2Cl ← CH2BrCl → CH2Br + Cl, with CH2BrCl initially in its vibrational ground state. For weak-field excitation, the Br/Cl branching ratio increases as a function of wavelength, however, for wavelengths below 180 nm the branching ratio cannot be made smaller than 0.4. Using optimal control theory, we show that the branching ratio can be made significantly less than 0.4, only when very strong fields are employed. Thus, the present work strongly suggests that a Tannor-Rice type laser control mechanism for selective bond breakage in CH2BrCl cannot take place without accompanying photoionization.

Original languageEnglish
JournalJournal of Chemical Physics
Publication date2012
Volume136
Issue17
Pages174303
Number of pages9
ISSN0021-9606
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 3

Keywords

  • PHYSICS, QUANTUM-OPTIMAL-CONTROL, WAVE-PACKET, LASER-PULSE, PHOTODISSOCIATION DYNAMICS, EXPECTATION VALUE, CH2BRCL, SYSTEMS, NM, FRAGMENTATION, IONIZATION
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