Threshold behavior for collision-induced dissociation of CsCl and Cs/sub 2/Cl/sub 2/ by SF/sub 6/ molecules

Journal Article · Tue Aug 01 00:00:00 EDT 1978 · J. Chem. Phys.; (United States)

OSTI ID:6752829

Parks, E K; Sheen, S H; Wexler, S

Absolute cross sections have been determined for collision-induced dissociation of cesium chloride (monomer and dimer) from collisions with SF/sub 6/ molecules. SF/sub 6/ was aerodynamically accelerated in H/sub 2/ to laboratory energies up to 11 eV. Mass analysis of the product ions indicate the occurrence of the reactions (a) SF/sub 6/+CsCl..-->..SF/sub 6/+Cs/sup +/+Cl/sup -/, (b) SF/sub 6/+Cs/sub 2/Cl/sub 2/..-->..SF/sub 6/ +Cs/sub 2/Cl/sup +/+Cl/sup -/, (c) SF/sub 6/+Cs/sub 2/Cl/sub 2/..-->..SF/sub 6/+Cs/sup +/+CsCl/sub 2//sup -/. The absolute cross sections for these reactions were determined from threshold to approximately 2 eV above threshold. In this energy region, the cross sections were accurately represented by a power law, sigma=A/sub 0/ x (E/sub tot/-E/sub 0/)/sup n//E/sub rel/, where E/sub tot/ is the total energy, E/sub 0/ the threshold energy, and E/sub rel/ the relative kinetic energy. Values for A/sub 0/ for Reactions (a) and (b) are approximately an order of magnitude smaller than for the analogous reactions with Xe, while A/sub 0/ for Reaction (c) is a factor of 3 smaller. In spite of the molecular character of the projectile the thresholds for Reactions (a) and (b) are very near those observed in the case of Xe. For Reaction (c), however, the threshold is about 1 eV higher. The powers n obtained for the above reactions are all about 1.0 higher than those obtained for the reactions with Xe. This effect, in particular, most likely arises from the SF/sub 6/ internal degrees of freedom which absorb energy in the collision.

• Research Organization: Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439
• OSTI ID: 6752829
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 69:3; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ALKALI METAL COMPOUNDS
BEAMS
CESIUM CHLORIDES
CESIUM COMPOUNDS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COLLISIONS
CROSS SECTIONS
DISSOCIATION
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
MOLECULAR BEAMS
MOLECULE COLLISIONS
MOLECULE-MOLECULE COLLISIONS
SULFUR COMPOUNDS
SULFUR FLUORIDES