Dynamical resonances accessible only by reagent vibrational excitation in the F + HD->HF + D reaction.
In: Science (New York, N.Y.), Jg. 342 (2013-12-20), Heft 6165, S. 1499-502
Online
academicJournal
Zugriff:
Experimental limitations in vibrational excitation efficiency have previously hindered investigation of how vibrational energy might mediate the role of dynamical resonances in bimolecular reactions. Here, we report on a high-resolution crossed-molecular-beam experiment on the vibrationally excited HD(v = 1) + F → HF + D reaction, in which two broad peaks for backward-scattered HF(v' = 2 and 3) products clearly emerge at collision energies of 0.21 kilocalories per mole (kcal/mol) and 0.62 kcal/mol from differential cross sections measured over a range of energies. We attribute these features to excited Feshbach resonances trapped in the peculiar HF(v' = 4)-D vibrationally adiabatic potential in the postbarrier region. Quantum dynamics calculations on a highly accurate potential energy surface show that these resonance states correlate to the HD(v' = 1) state in the entrance channel and therefore can only be accessed by the vibrationally excited HD reagent.
Titel: |
Dynamical resonances accessible only by reagent vibrational excitation in the F + HD->HF + D reaction.
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Autor/in / Beteiligte Person: | Wang, T ; Chen, J ; Yang, T ; Xiao, C ; Sun, Z ; Huang, L ; Dai, D ; Yang, X ; Zhang, DH |
Link: | |
Zeitschrift: | Science (New York, N.Y.), Jg. 342 (2013-12-20), Heft 6165, S. 1499-502 |
Veröffentlichung: | <Oct. 4, 1991- > : Washington, DC : American Association for the Advancement of Science ; <i>Original Publication</i>: New York, N.Y. : [s.n.] 1880-, 2013 |
Medientyp: | academicJournal |
ISSN: | 1095-9203 (electronic) |
DOI: | 10.1126/science.1246546 |
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