Negative collision energy dependence of Br formation in the OH + HBr reaction.
The reaction between HBr and OH leading to H(2)O and Br in its ground state is studied by means of a crossed molecular beam experiment for a collision energy varying from 0.05 to 0.26 eV, the initial OH being selected in the state |JOmega> = |3/2 3/2> by an electrostatic hexapole field. The reaction cross-section is found to decrease with increasing collision energy. This negative dependence suggests that there is no barrier on the potential energy surface for the formation pathway considered. The experimental results are compared with the previously reported quantum scattering calculations of Clary et al. (D. C. Clary, G. Nyman and R. Hernandez, J. Phys. Chem., 1994, 101, 3704), and briefly discussed in the light of skewed potential energy surfaces associated with heavy-light-heavy type reactions.
Che
Dock-Chil
DC
Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka, 560-0043, Japan.
Matsuo
Takashi
T
Yano
Yuya
Y
Bonnet
Laurent
L
Kasai
Toshio
T
D001966:Bromine / Q000737:chemistry*; D018054:Hydrobromic Acid / Q000737:chemistry*; D017665:Hydroxyl Radical / Q000737:chemistry*; D011789:Quantum Theory; D013816:Thermodynamics; D014867:Water / Q000737:chemistry
D014867:Water; D017665:Hydroxyl Radical; D018054:Hydrobromic Acid; D001966:Bromine