Molecular beam scattering experiments on the abstraction and exchange reactions of deuterium atoms with the hydrogen halides HCl, HBr, and HI
Molecular beam scattering experiments have been carried out on the abstraction and exchange reactions of deuterium atoms (T=2600 K) with the hydrogen halides HX(T=300 K) in the range of scattering angles: 0/sup 0/< or =theta/sub cm/< or =70/sup 0/ (theta/sub cm/=0/sup 0/ is the direction of the incident D-atom beam). The apparatus employed a very sensitive electron bombardment detector with a sufficiently low H/sub 2/ background to make possible the measurement of differential cross sections of about 0.1 A/sup 2//sr for reactively scattered HD and H and nonreactively scattered D-atoms. The measured HD signal can be largely attributed to various background sources and only serves to establish a rough upper limit on the abstraction cross section in the angular range investigated. The H-atom signal was more intense. The observed angular distribution was forward peaked, and is attributed to the exchange reaction. The nonreactively scattered D-atom signal was used in conjunction with a recently reported effective spherically symmetric potential to provide an absolute calibration of the detector sensitivity. The measured integral cross sections for the exchange reactions are 2.3 A/sup 2/ (D+HCl), 1.3 A/sup 2/ (D+HBr) and 1.6 A/sup 2/ (D+HI) with an estimated error of about +- 30%. The absolute cross sections and the H-atom angular distributions are consistent with the DX distributions measured by McDonald and Herschbach. Both experimental angular distributions are considerably narrower than those predicted by the recent classical trajectory calculations of Raff, Suzukawa, and Thompson. The implications of the new data for the activation energies for the exchange reactions are discussed.
- Research Organization:
- Max-Planck-Institut fuer Stroemungsforschung, 3400 Goettingen, Federal Republic of Germany
- OSTI ID:
- 7087028
- Journal Information:
- J. Chem. Phys.; (United States), Vol. 68:10
- Country of Publication:
- United States
- Language:
- English
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DEUTERIUM
ATOM-MOLECULE COLLISIONS
HYDRIODIC ACID
HYDROBROMIC ACID
HYDROCHLORIC ACID
ATOMIC BEAMS
CHEMICAL REACTIONS
ISOTOPIC EXCHANGE
MOLECULAR BEAMS
ATOM COLLISIONS
BEAMS
COLLISIONS
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
INORGANIC ACIDS
IODINE COMPOUNDS
ISOTOPES
LIGHT NUCLEI
MOLECULE COLLISIONS
NUCLEI
ODD-ODD NUCLEI
STABLE ISOTOPES
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena