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Science 6 October 1995:
Vol. 270. no. 5233, p. 9
DOI:

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This Week in Science

Molecules can be excited and photodissociated with lasers, but it is often difficult to manipulate the course of the reaction with lasers so that the products formed can be controlled. Zhu et al. (p. 77) now report that the outcome of the photoexcitation of hydrogen iodide (HI) can be controlled by how the energy is deposited (either as three ultraviolet photons or as one vacuum ultraviolet photon with the same energy). By modulating the phase difference between the two lasers, quantum mechanical interference was used to control the relative amounts of HI+ and I+ produced.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)