Crossed beams studies of nonadiabatic collision dynamics
Nonadiabatic product channels have been studied for a variety of collision processes using crossed molecular beams under single collision conditions. Laboratory angular distributions, translational energy distributions and collision energy dependence have been measured for several chemiionization reactions in an effort to gain an understanding of the underlying collision dynamics. In addition, reactivity has been studied as a function of excited state orbital alignment in a number of these chemiionization reactions, and very strong alignment effects are observed. Chemiions Ba{sup +} and BaBr{sup +} produced in reaction of Ba({sup 1}S{sub 0}, {sup 1}P{sub 1}) with Br{sub 2} were studied as a function of laboratory scattering angle, translational energy release, barium electronic state and alignment of the barium p orbital at collision energies of 1.1 and 1.5 eV. The contour map obtained for the BaBr{sup +} product indicates a close near-collinear collision is required to gain access to the region in which the second electron transfer may occur. Chemiions Ba{sup +}, BaO{sup +}, BaO{sub 2}{sup +} from reaction of ground state and electronically excited Ba with O{sub 3} were studied in an effort to extend the insights obtained in the Br{sub 2} studies to an atom-triatom system. A profound dependence of reactive signal on orbital alignment was observed at some scattering angles, despite the reduced symmetry of these systems compared to Br{sub 2}. Contour maps of scattered Ba({sup 3}P{sub 2}) flux from collision of Ba({sup 1}P{sub 1}) with O{sub 2} and N{sub 2} were obtained from simulations of measured Ba({sup 3}P{sub 2}) Doppler spectra taken at a variety of probe laser angles in a crossed beams experiment. 149 refs., 43 figs., 3 tabs.
- Research Organization:
- Lawrence Berkeley Lab., CA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5405309
- Report Number(s):
- LBL-30901; ON: DE91016250
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BARIUM
ATOM-MOLECULE COLLISIONS
ANGULAR DISTRIBUTION
BROMINE
COLLIDING BEAMS
DYE LASERS
EV RANGE
EXCITED STATES
ION DETECTION
MOLECULAR BEAMS
NITROGEN
OPTICAL PUMPING
OXYGEN
OZONE
ALKALINE EARTH METALS
ATOM COLLISIONS
BEAMS
CHARGED PARTICLE DETECTION
COLLISIONS
DETECTION
DISTRIBUTION
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
HALOGENS
LASERS
LIQUID LASERS
METALS
MOLECULE COLLISIONS
NONMETALS
PUMPING
RADIATION DETECTION
400201* - Chemical & Physicochemical Properties