( ) ( )

Results and Discussions The time evolution of different reactivity parameters are depicted in Figs. 1-12. All quantities are in atomic units. Unless otherwise specifi ed, in all fi gures a and b refer to the ground state (n=1) and excited state (n=20) of the hydrogen atom, respectively, and a red colored solid line and blue colored solid line respectively signify monochromatic and bichromatic pulses.