Low-energy electron scattering by pyrazine
- Creators
- Winstead, Carl
- McKoy, Vincent
Abstract
We report cross sections for low-energy elastic electron collisions with the diazabenzene molecule pyrazine, obtained from first-principles calculations. The integral elastic cross section exhibits three sharp peaks that are nominally shape resonances associated with trapping in the vacant pi* molecular orbitals. Although the two lowest-energy resonances do in fact prove to be nearly pure single-channel shape resonances, the third contains a considerable admixture of core-excited character, and accounting for this channel coupling effect is essential to obtaining an accurate resonance energy. Such resonant channel coupling has implications for electron interactions with the DNA bases, especially the pyrimidine bases for which pyrazine is a close analog. In the absence of data on pyrazine itself, we compare our elastic differential cross section to measurements on benzene and find close agreement.
Additional Information
©2007 The American Physical Society (Received 4 June 2007; published 18 July 2007) This work was supported by the Department of Energy, Office of Basic Energy Sciences. We gratefully acknowledge use of the computational resources of the Jet Propulsion Laboratory's Supercomputing and Visualization Facility.Files
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Additional details
- Eprint ID
- 8455
- Resolver ID
- CaltechAUTHORS:WINpra07
- Created
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2007-08-14Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field