Crossed molecular-beam studies. Final report, 1 October 1981-30 September 1984
This report summarizes three of investigations: 1) studies of van der Waals collision dynamics, 2) laser spectroscopy study of rotational vibrational relaxations, and 3) angular correlations in chemical reactions. A crossed molecular-beam apparatus was used to study several van der Waals bond-exchange reactions. These collisions involving extremely weak interactions were found to have product velocity distributions that resemble those from several ion molecular reactions that occur at very high collision energy. This led to the theoretical development of a scattering model which should be applicable to a wide range of reactive and inelastic collision processes at kinetic energies higher than the bond strengths. In another effort, laser-induced fluorescence experiments were performed to measure the rotational and vibrational temperatures of molecular iodine seeded in beams of helium, argon, or nitrogen expanded from a supersonic nozzle. The results demonstrated the utility of seeded iodine fluorescence as a diagnostic for pulse shape and collisional relaxation in pulsed supersonic beams. Lastly, theoretical calculations dealing with rotational orientation in molecular collisions resulted in the formulation of a correlation analysis which offers a means to obtain information about collision dynamics that would otherwise be lost by averaging over the initial impact parameters and molecular orientations.
- Research Organization:
- Harvard Univ., Cambridge, MA (USA). Dept. of Chemistry
- OSTI ID:
- 6061575
- Report Number(s):
- AD-A-183166/8/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR CORRELATION
ARGON
BEAMS
CHEMICAL REACTIONS
COLLIDING BEAMS
COLLISIONS
CORRELATIONS
DISTRIBUTION
DYNAMICS
ELEMENTS
ENERGY
FLUIDS
GASES
HALOGENS
INTERACTIONS
IODINE
KINETIC ENERGY
KINETICS
MECHANICS
MOLECULAR BEAMS
MOLECULE COLLISIONS
MOTION
NONMETALS
PULSES
RARE GASES
REACTION KINETICS
RELAXATION
ROTATION
SCATTERING
SHAPE
SPECTROSCOPY
VAN DER WAALS FORCES
VELOCITY