Dependence of the molecular iodine B-state predissociation induced by a femtosecond laser pulse on pulse phase modulation

The processes of pumping and laser-induced predissociation of B-states of the I₂ molecule under the action of femtosecond laser pulses are considered theoretically. An analytical formula is derived, which describes the dependence of the predissociation on such parameters of femtosecond pulses as spectral chirp, spectral width and delay time between pulses. The formula is used to calculate numerically the dependence of the predissociation yield on the parameters of the phase modulation of the pump pulse and coupling pulse.