Production of excited hydrogen molecule in a two-frequency chirped laser field

Abstract

We have studied the population transfer in a 1+1 ladder system from v = 0, j = 0 of X 1 Σ g + state to J 1 Δ g +(v = 2, j = 2) state using two frequency-chirped laser pulses and thus to create excited hydrogen molecule. The first chirped frequency connects the ground level with two nonadiabatically coupled (i.e. dressed) intermediate levels, B 1 Σ u +(v = 14, j = 1) and C 1 Π u (v = 3, j = 1), while the second chirped pulse excites the intermediate levels to the final target level. Here both the chirped fields produce adiabatic crossings due to the chirping actions and facilitate the population transfer to the higher levels. We reported complete population transfer to the highly excited bound electronic level J 1 Δ g +(v = 2, j = 2) using appropriate laser parameters of the two chirped laser pulses for all combinations of negatively and positively chirped fields. We explained the population transfer by drawing adiabatic dressed states including nonadiabatic interaction.