4 research outputs found
The excitation function for Li+HF-->LiF+H at collision energies below 80 meV
We have measured the dependence of the relative integral cross section of the
reaction Li+HF-->LiF+H on the collision energy using crossed molecular beams.
By varying the intersection angle of the beams from 37{\deg} to 90{\deg} we
covered the energy range 25 meV < E_tr < 131 meV. We observe a monotonous rise
of the cross section with decreasing energy over the entire energy range
indicating that a possible translational energy threshold to the reaction is
significantly smaller than 25 meV. The steep rise is quantitatively recovered
by a Langevin-type excitation function based on a vanishing threshold and a
mean interaction potential energy ~R^-2.5 where R is the distance between the
reactants. To date all threshold energies deduced from ab-initio potentials and
zero-point vibrational energies are at variance with our results, however, our
findings support recent quantum scattering calculations that predict
significant product formation at collision energies far below these theoretical
thresholds.Comment: 8 pages, 7 figure
Entwicklung und Erprobung eines neuartigen zeit- und ortssensitiven Detektors zur Laserdiagnostik von chemischen Reaktionen und Analyse von Fluoreszenzlebensdauern, 3D-Teilchenspuren und Entfernungen
Bobbenkamp R. Entwicklung und Erprobung eines neuartigen zeit- und ortssensitiven Detektors zur Laserdiagnostik von chemischen Reaktionen und Analyse von Fluoreszenzlebensdauern, 3D-Teilchenspuren und Entfernungen. Bielefeld; 2001