Collisions of halogen (/sup 2/P) and rare gas (/sup 1/S) atoms
Differential cross sections I(theta) at several collision energies measured in crossed molecular beam experiments are reported for several combinations of halogen atoms (/sup 2/P) scattered off rare gas atoms (/sup 1/S/sub 0/), namely, F + Ne, F + Ar, F + Kr, F + Xe, and Cl + Xe. The scattering is described by an elastic model appropriate to Hund's case c coupling. With the use of this model, the X 1/2, I 3/2, and II 1/2 interaction potential energy curves are derived by fitting calculated differential cross sections, based on analytic representations of the potentials, to the data. The F-Xe X 1/2 potential shows a significant bonding qualitatively different from that of the other F-rare gas combinations. The I 3/2 and II 1/2 potentials closely resemble the van der Waals interactions of the one-electron-richer ground-state rare gas-rare gas systems. Coupled-channel scattering calculations are carried out for F + Ar, F + Xe, and Cl + Xe by use of the realistic potential curves derived earlier. The results justify the use of the elastic model, and give additional information on intramultiplet and intermultiplet transitions. The transitions are found to be governed by the crossing of the two ..cap omega.. = 1/2 potentials in the complex plane. The measured I(theta) and I(theta) derived from the coupled-channel computations show small oscillations or perturbations (Stueckelberg oscillations) though quantitative agreement is not obtained. The nature of the anomalous F - Xe X 1/2 potential is discussed as is the approximation of a constant spin-orbit coupling over the experimentally accessible range of internuclear distances for these open-shell molecules.
- Research Organization:
- California Univ., Berkeley (USA)
- OSTI ID:
- 5428579
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FLUORINE
ATOM-ATOM COLLISIONS
NEON
ARGON
KRYPTON
CHLORINE
XENON
COLLIDING BEAMS
COUPLED CHANNEL THEORY
DIFFERENTIAL CROSS SECTIONS
L-S COUPLING
POTENTIALS
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
GRAPHS
ATOM COLLISIONS
BEAMS
COLLISIONS
COUPLING
CROSS SECTIONS
DATA
DATA FORMS
ELEMENTS
HALOGENS
INFORMATION
INTERMEDIATE COUPLING
NONMETALS
NUMERICAL DATA
RARE GASES
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena