Time-Resolved Studies of Molecular Processes Involving Transient Species by Synchronously-Pulsed Optical Excitation and Diagnostic Electron Scattering.
Rept. for 15 Jun 85-14 Jun 86.
ARKANSAS UNIV FAYETTEVILLE DEPT OF CHEMISTRY AND BIOCHEMISTRY
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We are constructing a Time Resolved Electron Diffractometer TRED to study the structures of short-lived, energetic molecular states and the dynamics of primary dissociation processes found in molecules of energetic materials. The experiments in preparation make use of the technology and techniques developed on our real time data acquisition Gas Electron Diffractometer GED, which is currently the only one of its kind. In this instrument, a 40 keV, continuous, focused electron beam is crossed at right angles by a gaseous molecular beam, and the electron scattering pattern generated is converted to an optical image by a phosphor screen this image is then transferred by a lens onto a 1024 element photodiode array PDA. The channels of the PDA detect the angular dependence and intensity profile of the electron scattering along a radial line of the circularly symmetric pattern. This new procedure effectively replaces conventional photographic GED techniques. On line optimization of GED experimental conditions and ratiometric data analysis are essential for studying short lived energetic species and for performing time resolved investigations.
- Atomic and Molecular Physics and Spectroscopy