Abstract This paper studies the multiphoton resonant ionization by two-colour laser pulses in the hydrogen atom by solving the time-dependent Schr?dinger equation. By fixing the parameters of fundamental laser field and scanning the frequency of second laser field, it finds that the ionization probability shows several resonance peaks and is also much larger than the linear superposition of probabilities by applying two lasers separately. The enhancement of the ionization happens when the system is resonantly pumped to the excited states by absorbing two or more colour photons non-sequentially.
Received: 28 January 2008
Revised: 04 May 2008
Accepted manuscript online:
PACS:
32.80.Rm
(Multiphoton ionization and excitation to highly excited states)
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