Dynamics of the reaction H/sup +//sub 2/+H/sub 2/. -->. H/sup +//sub 3/+H, with isotopic variations

Journal Article · Thu Dec 01 04:00:00 EST 1977 · J. Chem. Phys.; (United States)

OSTI ID:5280631

Douglass, C H; McClure, D J; Gentry, W R

We performed a merged-beam study of the reactions HD/sup +/+D/sub 2/..-->..HD/sup +//sub 2/+D, D/sup +//sub 3/+H, D/sup +//sub 2/+HD..-->..HD/sup +//sub 2/+D, D/sup +//sub 3/+H, in which we measured the absolute reaction cross sections, branching ratios, and product energy distributions over the range of relative kinetic energy from approx.0.002 to 8 eV. Within the experimental uncertainty all three types of data are identical for the two reactant charge states at initial kinetic energies less than 0.5 eV, leading us to believe that adiabatic charge equilibration between the reactants occurs prior to reaction at these low energies. Diabatic behavior becomes increasingly dominanant at higher energies. The reaction mechanism is direct and products are formed with a broad distribution of translational energies. In low energy collisions, on the average, a small fraction of the reaction exothermicity and the reactant excitation energy is converted into translational energy of the products. At higher energies there is a net conversion of translational into internal energy. The reaction energetics are not in agreement with stripping model predictions.

• Research Organization: Chemical Dynamics Laboratory, Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
• OSTI ID: 5280631
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 67:11; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
BEAMS
BRANCHING RATIO
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
DEUTERIDES
DEUTERIUM
DEUTERIUM COMPOUNDS
DEUTERIUM IONS
ELEMENTS
ENERGY SPECTRA
FLUIDS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
HYDROGEN ISOTOPES
ION BEAMS
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
ISOTOPES
ISOTOPIC EXCHANGE
LIGHT NUCLEI
MOLECULAR BEAMS
MOLECULAR IONS
MOLECULE COLLISIONS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
SPECTRA
STABLE ISOTOPES