Reaction dynamics of electronically excited alkali atoms with simple molecules
The reactions of electronically excited sodium have been studied using the crossed molecular beams method. Reactions of Na(3S,3P,4D,5S) + HCl have been studied in detail. A large increase in the reactive cross section with electronic energy is observed. A change in the reaction mechanism leads to very different product scattering distributions for Na(3P) vs Na(4D,5S) scattering. Laser polarization dependences show that this is due to long range electron transfer in Na(4D) + HCl that does not occur for Na(3P) + HCl. No reaction was observed for Na(3S,3P,4D) + HF up to collision energies of 13 kcal/mole. Na(3S,3P) + HBr behave much like the equivalent HCL reactions, except that the reduced endothermicity leads to more ground state reaction for HBr. Chapter III describes the reaction of Na with O/sub 2/. No reaction is seen for Na(3S,3P,4S,4P,5S) + O/sub 2/. Reaction to form NaO + O is observed for Na(4D) + O/sub 2/ above the threshold translational energy of 15 +- kcal/mole. The reactions of Na(3S,3P,4D) + CH/sub 3/Br are described in chapter IV. The alkali halide product is predominantly back scattered due to steric restrictions. With increasing electronic excitation, a small relaxation of the restriction is observed. The reactions of Na(3S,3P) + Cl/sub 2/ are described in chapter V. At a collision energy of 6 kcal/mole, the reactive cross section increases 60% on electronic excitation, while at a higher collision energy, 19 kcal/mole, there is an increase of only 16%.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5796107
- Report Number(s):
- LBL-21205; ON: DE86012010
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ALKALI METALS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
BEAMS
BROMINATED ALIPHATIC HYDROCARBONS
CHLORINE
COLLIDING BEAMS
COLLISIONS
ELEMENTS
HALOGENATED ALIPHATIC HYDROCARBONS
HALOGENS
HYDROBROMIC ACID
HYDROCHLORIC ACID
HYDROFLUORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
METHYL BROMIDE
MOLECULE COLLISIONS
NONMETALS
OPTICAL PUMPING
ORGANIC BROMINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN
PUMPING
SODIUM