Controlling vibrational population distribution of the Na2 molecule by ultrashort pulses in the three-state system
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The population transfer and vibrational population distribution of the target state in the three-state Na2 molecule are theoretically investigated by using the time-dependent wave packet method. The population can be efficiently transferred to the target state by the process of adiabatic passage by light induced potentials (APLIP). The vibrational population distribution of the target state can be controlled by adjusting the laser parameters, such as the pulse width, time delay, intensity and envelope. The calculations show the vibrational population distribution variations under different laser parameters where the preparation of the specific state for molecules can be rationalised. In addition, the influence of the ionization state on the population transfer is studied.