Photodissociation processes in molecular beams
A description is presented of a study of the photodissociation dynamics of molecules in a molecular beam. Photo-fragmentation translational spectroscopy has been utilized to observe the photodissociation dynamics of ozone. Using a supersonic molecular beam and a 10 nanosecond pulsed laser at lambda = 266 nm, the velocities of the fragment products are measured by the method of time of flight. The resolution of the time of flight spectrum of ozone is sufficiently high that the electronic and vibrational states are clearly resolved and identified. Above the threshold (lambda < 310 nm), the quantum yield for the production of O(/sup 1/D) has been estimated in the past to be unity for the process O/sub 3/ (/sup 1/A/sub 1/) + h..nu..)lambda < 300 nm) ..-->.. O/sub 3/(/sup 1/B/sub 2/) ..-->.. O/sub 2/(/sup 1/..delta../sub g/) + O(/sup 1/D). However a small production of O/sub 2/ (/sup 3/..sigma../sub g//sup -/) + O(/sup 3/P) has been observed in this study. The O/sub 2/(/sup 1/..delta../sub g/) product yields four vibrational states (v = 0, 1, 2, 3) which yields a vibrational temperature of 2700/sup 0/K along with narrow energy distributions of rotational levels. These energy distributions are compared with photodissociation models along with the polarization dependence of the dissociative process which was also measured. 143 references.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.; California Univ., Berkeley (USA). Dept. of Chemistry
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6027267
- Report Number(s):
- LBL-9219
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTRA
ANGULAR DISTRIBUTION
BEAMS
COLLISIONS
COORDINATES
DATA
DATA FORMS
DISSOCIATION
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
ENERGY
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
GRAPHS
INFORMATION
INVARIANCE PRINCIPLES
ISOLATED VALUES
LASER RADIATION
MOLECULAR BEAMS
MOLECULE COLLISIONS
MOLECULES
NUMERICAL DATA
OZONE
PHOTON COLLISIONS
PHOTON-MOLECULE COLLISIONS
POLARIZATION
RADIATIONS
ROTATIONAL STATES
SCALE INVARIANCE
SPECTRA
SPECTROSCOPY
THRESHOLD ENERGY
TIME-OF-FLIGHT METHOD
ULTRAVIOLET RADIATION
VELOCITY
VIBRATIONAL STATES
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTRA
ANGULAR DISTRIBUTION
BEAMS
COLLISIONS
COORDINATES
DATA
DATA FORMS
DISSOCIATION
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
ENERGY
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
GRAPHS
INFORMATION
INVARIANCE PRINCIPLES
ISOLATED VALUES
LASER RADIATION
MOLECULAR BEAMS
MOLECULE COLLISIONS
MOLECULES
NUMERICAL DATA
OZONE
PHOTON COLLISIONS
PHOTON-MOLECULE COLLISIONS
POLARIZATION
RADIATIONS
ROTATIONAL STATES
SCALE INVARIANCE
SPECTRA
SPECTROSCOPY
THRESHOLD ENERGY
TIME-OF-FLIGHT METHOD
ULTRAVIOLET RADIATION
VELOCITY
VIBRATIONAL STATES