Optimising laser pulses for selective vibrational excitations and photo-dissociation of the C–H bond in methane

AbstractThis paper presents a study on the optimisation of laser pulse parameters using an optimal control theory based adaptive simulated annealing technique. The objective of this study is to obtain a cost-effective laser pulse that can selectively excite the vibrational state and cause photo-dissociation of the C–H bond in a methane molecule. We have optimised both sinusoidal and linear ramped pulses using the proposed technique, and incorporated a linear chirping in the field as well. The results demonstrate the effectiveness of the proposed approach in designing laser pulses for targeted molecular excitation and dissociation.KEYWORDS: Photo-dissociationlaser pulse designoptimal control theorysimulated annealing techniqueFourier grid Hamiltonian method AcknowledgementsThe work was supported by UGC, Govt. of India, under CAS program [Grant no. F.540/8/CAS-II/2015(SAPI)].Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by UGC, Govt. of India [grant number F.540/8/CAS-II/2015(SAPI)].