2008, Vol.11, No.2, pp.292-298
Fundamental aspects of the multiphoton dissociation process of a
diatomic molecule induced by an infrared laser are described
quantitatively and analyzed in the context of both classical and
quantum mechanics. The emphasis is on the exploration of the
effects of variation of pulse shape and of initial phase, two
field parameters whose influence has not been examined
systematically in the past. It is found that, a) the effects of
pulse shape changes are more important for frequencies lower of
the frequency
giving the maximum escape probability
than for frequencies higher of
and b) the initial
field phase affects the escape probability even when the pulse
contains as many as 100 cycles. Analysis of the results of
calculations shows that classical dynamics captures the main
trends that are revealed by quantum dynamics. An explanation of
the findings is provided in terms of the modifications in
classical phase space and of energy exchanges between the main
periodic orbits of the oscillator and the external field.
Key words:
classical/quantum dynamics, chaos, multiphoton
dissociation
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