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Coherent Control of Chemical Reactions 215
FIGURE 7 Potential energy curves for Na 2 , showing the excitation scheme for incoherent phase control of the
photodissociation of the molecule. [Reproduced with permission from Chen, Z., Shapiro, M., and Brumer, P. (1993).
J. Chem. Phys. 98, 6843. Copyright American Institute of Physics.]
at λ 1 = 356.2 nm (the three-photon wavelength) is caused The secondary maximum observed in the phase lag near
by the 5d(π,δ) resonance of HI. This resonance is ev- λ 1 = 355.4 nm has been attributed to a weak transition to
ident in the one-photon ionization spectrum (Fig. 11b), a vibrationally excited Rydberg state not visible in the
s
but is absent in the 2 + 1 REMPI spectrum (Fig. 11c). ionization spectrum. Examples of a minimum in |δ |,
13
FIGURE 8 Comparison of the experimental and theoretical yields for the reaction Na 2 → Na(3s) + Na(3d), obtained
by incoherent phase control. [Reproduced with permission from Chen, Z., Shapiro, M., and Brumer, P. (1993). J.
Chem. Phys. 98, 6843. Copyright American Institute of Physics.]
