Coherent Laser Control of the Product Distribution Obtained in the Photoexcitation of HI
Langchi Zhu(University of Illinois Chicago), Valeria D. Kleiman(University of Illinois Chicago), Xiaonong Li(University of Illinois Chicago), Shao Ping Lu(University of Illinois Chicago), Karen Trentelman(University of Illinois Chicago), Robert J. Gordon(University of Illinois Chicago)
Cited by 304
Abstract
Active control of the distribution of products of a chemical reaction was demonstrated by using a method based on the principle of quantum mechanical interference. Hydrogen iodide (HI) molecules were simultaneously excited above their ionization threshold by two competing pathways. These paths were absorption of three ultraviolet photons of frequency ω 1 and one vacuum ultraviolet photon of frequency ω 3 = 3ω 1 . The HI + and I + signals were modulated as the phase between the lasers was varied, with the HI + signal lagging by 150° ± 15°. A mechanism consisting of autoionization and predissociation is proposed.
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