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We investigate the effect of chirped excitation and the excitation detuning on the coherent control of population transfer and vibrational states in a four---level system. Density matrix equations are studied for optimally enhanced processes by considering specific parameters typical of oxazine systems. Our simulations show a strong dependence on the interplay between chirp and excitation detuning and predict enhancement factors up to 3.2 for population transfer and up to 38.5 for vibrationaldoi:10.3390/app6110351 fatcat:6ledzxiygnepboncjo647xf56e