  Visualizing and controlling electron dynamics over femtosecond timescale play
a key role in the design of next-generation electronic devices. Using
simulations, we demonstrate the electronic oscillation inside the naphthalene
molecule can be tracked by means of the tuning of delay time between two
identical femtosecond laser pulses. Both the frequency and decay time of the
oscillation are detected by the tunneling charge through the junction of
scanning tunneling microscopy. And the tunneling charge is sensitive to the
carrier-envelope phase (CEP) for few-cycle long optical pulses. While this
sensitivity to CEP will disappear with the increase of time-length of pulses.
Our simulation results show that it is possible to visualize and control the
electron dynamics inside the molecule by one or two femtosecond laser pulses.
