The dynamics of the isomerization of spiropyran was simulated based on the two-well model poten_tial. The possibility of effective control over the transition using phase-modulated (chirp-modulated) laser fem_tosecond pulses was studied. The probability of transitions to the A and B forms from the excited S1 state was evaluated at 1 : 5; i.e., the efficiency of the transition reached 80%. It is phase the modulation of viprational packets (purely quantum effect) that makes it possible to effectively control the behavior of the system;but one-parameter quartic modulation seemed not sufficient for total control.
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