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Encyclopedia of Physical Science and Technology EN003H-565 June 13, 2001 20:37
Coherent Control of Chemical Reactions 213
FIGURE 5 Apparatus used for coherent phase control.
the continuum, so that the two paths are 2ω 1 and 2ω 1 − ciation of the molecule, and spontaneous emission from
ω 2 + ω 2 . (The second path may be viewed as excitation Na(3p) and Na(3d) was used to monitor the branching
of the continuum by 2ω 1 followed by emission and re- ratio of Na(3s) + Na(3p) vs Na(3s) + Na(3d) fragments
absorption of an ω 2 photon.) In the example shown in as a function of ω 2 detuning. The experimental control of
Fig. 7, a pulsed dye laser (5 ns pulse width) was used the Na(3d) product shown in Fig. 8 is in excellent agree-
to dress the continuum of Na 2 with the v = 35, J = 38 ment with theory. Comparable results were obtained for
1
3
and v = 35, J = 36 resonances of the A u / u mani- the control of Na(3p), which reached a maximum near
−1
fold. A second dye laser (ω 1 ) induced two-photon disso- 13,317 cm .
