Molecular structure studies: a gas phase electron diffraction unit employing counting techniques. Final technical report, June 1, 1969--August 31, 1972

Construction of an electron-diffraction apparatus of unique design, employing electron-counting techniques, was undertaken. The apparatus is to be competitive with photographic diffraction units in terms of sample required, and it is hoped that it will be superior in versatility and in freedom from a number of sources of uncertainty. During the contract period the instrument chamber, vacuum system, counting electronics and logic, electron optics, and detection system were designed. Construction was completed on all but the detection system and final details of a mechanical drive. Work on this apparatus is to continue under sponsorship by the National Science Foundntion. (auth