Studies of Electron-Beam-Induced Decomposition of Benzene
Semiannual technical rept. no. 3
SRI INTERNATIONAL MENLO PARK CA
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Experiments have been performed using a Febetron 706 electron beam to study the problems that may occur when benzene is introduced into an electron accelerator. We particularly address the problem of electron-induced fragmentation and polymerization into nonvolatile species that deposit on surfaces, leading to the possibility of surface breakdown in accelerating gaps. Our results show that the amounts of fragmentation and deposition are quite small for a finite number of e-beam pulses, but that problems could arise after extended periods of use. As a conservative design guideline, we estimate that the fragmentation cross section for high energy electrons on benzene is approximately 10 to the minus 16th power sq. cm. and that 10 of these collisions lead to surface deposits.
- Organic Chemistry
- Radiation and Nuclear Chemistry