Controlling ground-state rotational dynamics of molecules by shaped femtosecond laser pulses

摘要: We report controlled excitation of ground-state rotational wave packet by pulse-shaping technique. The experiment is conducted in nitrogen $({\mathrm{N}}_{2})$ at room temperature and atmospheric pressure. A femtosecond laser pulse produces coherences the vibronic ground state ${\mathrm{N}}_{2}$ through an impulsive Raman process. tailored using a spatial light modulator producing spectral phase modulation. Periodic steps are applied order to control specific transitions. outcome modification relative between odd even states which allows symmetry rephasing period packet.