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Science 10 March 2006:
Vol. 311. no. 5766, p. 1341
DOI: 10.1126/science.311.5766.1341b
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This Week in Science
Gas-phase spectroscopy and accompanying theoretical computations have been used to resolve two long-standing puzzles in the interplay of electronic and nuclear molecular motion in chemical reactions (see the Perspective by Zare). Yin et al. (p. 1443) probed the impact of electronic state on the unimolecular dissociation of formaldehyde (H2CO) into H and HCO products. Their results suggest that bond scission in the ground state produces rapidly rotating HCO, whereas dissociation in the excited triplet state yields vibrationally excited HCO. Qiu et al. (p. 1440) studied a bimolecular reaction: collision of an F atom with H2 to yield HF and H. At a specific collision energy, the experiments and theory point to a transient complex, termed a Feshbach resonance, in which the colliding partners vibrate several times before rearranging to products.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
