Accession Number : ADA183907

Title :   Time-Resolved Electron Diffraction.

Descriptive Note : Annual technical rept.,

Corporate Author : ARKANSAS UNIV FAYETTEVILLE DEPT OF CHEMISTRY AND BIOCHEMISTRY

Personal Author(s) : Miller, R S

PDF Url : ADA183907

Report Date : Jan 1987

Pagination or Media Count : 8

Abstract : It is the goal of this research to construct an instrument for Time-Resolved Electron Diffraction (TRED) studies of the structures of short-lived, energetic molecular states and of the dynamics of primary dissociation processes found in molecules of energetic materials. The TRED experiments will be performed by focusing a pulsed ArF excimer laser onto the cold photocathode of a high voltage electron gun, where electron pulses will be generated by field-assisted photoelectric emission. These electron pulses will be scattered off the gas-phase molecules in an effusive molecular beam after some fraction of the beam population has been excited by a pulse from a XeCl excimer-pumped dye laser. Electron diffraction intensities will be recorded using the real-time gas electron diffraction (GED) technology developed at the University of Arkansas. By synchronizing the dye laser excitation pulse and the diagnostic electron pulse, intensity data can be obtained from molecules which all have the same age relative to the time of excitation. Thus, time-resolved observations of excited molecular states and of transient reaction products should be possible.

Descriptors :   *ELECTRON DIFFRACTION, *MOLECULAR STATES, *PHOTOELECTRIC EMISSION, *LASER PUMPING, *COLD CATHODE TUBES, DIAGNOSIS(GENERAL), ELECTRONS, INTENSITY, ENERGETIC PROPERTIES, LOW TEMPERATURE, PHOTOCATHODES, DYE LASERS, EXCITATION, PULSED LASERS, EFFUSION, MOLECULAR BEAMS, ELECTROMAGNETIC PULSES, EXCIMERS, LASERS, TIME STUDIES, ELECTRON GUNS, HIGH VOLTAGE, MOLECULES, DISSOCIATION, ELECTRON DIFFRACTION, TIME, REACTANTS(CHEMISTRY), TRANSIENTS, GASES, REAL TIME

Subject Categories : Electricity and Magnetism
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE