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APS » Phys. Rev. Lett. » Volume 98 » Issue 11

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Phys. Rev. Lett. 98, 113201 (2007) [4 pages]

Resonant Channel Coupling in Electron Scattering by Pyrazine

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Carl Winstead and Vincent McKoy
A. A. Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, USA

Received 18 December 2006; published 13 March 2007

Detailedinvestigation of the three low-energy resonances seen in electron scatteringby the diazabenzene molecule pyrazine reveals that the first twoare nearly pure single-channel shape resonances, but the third is,as long suspected, heavily mixed with core-excited resonances built onlow-lying triplet states. Such resonant channel coupling is likely tobe widespread in -ring molecules, including the nucleobases of DNAand RNA, where it may form a pathway for radiationdamage.

©2007 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.98.113201
DOI:	10.1103/PhysRevLett.98.113201
PACS:	34.80.Bm; 34.80.Gs 34.80.Bm Elastic scattering of electrons by atoms and molecules 34.80.Gs Molecular excitation and ionization by electron impact YEAR: 2007

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