Energy-dependent cross sections and nonadiabatic reaction dynamics in F(2P3/2,2P1/2)+n–H2→HF(v,J)+H
| Autor: | Bradley W. Blackmon, David J. Nesbitt, William B. Chapman, Warren W. Harper, Sergey A. Nizkorodov |
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| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | The Journal of Chemical Physics. 111:8404-8416 |
| ISSN: | 1089-7690 0021-9606 |
| Popis: | High-sensitivity direct IR laser absorption methods are exploited to investigate quantum state-resolved reactive scattering dynamics of F+n-H2(j=0,1)→HF(v,J)+H in low-density crossed supersonic jets under single collision conditions. Nascent rotational state distributions and relative cross sections for reactive scattering into the energetically highest HF (v=3,J) vibrational manifold are obtained as a function of center-of-mass collision energies from Ecom=2.4 kcal/mole down to 0.3 kcal/mole. This energy range extends substantially below the theoretically predicted transition state barrier [Ebarrier≈1.9 kcal/mole; K. Stark and H. Werner, J. Chem. Phys. 104, 6515 (1996)] for the lowest adiabatic F(2P3/2)+H2 potential energy surface, therefore preferentially enhancing nonadiabatic channels due to spin–orbit excited F*(2P1/2) (ΔEspin–orbit=1.15 kcal/mole) in the discharge source. The HF (v=3,J) cross sections decrease gradually from 2.4 kcal/mole down to the lowest energies investigated (Ecom≈0.3 kcal/mole)... |
| Databáze: | OpenAIRE |
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