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Resonant neutral-particle emission after collisions of electrons with base-stacked oligonucleotide cations in a storage ring |
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| Authors: | Tetsumi Tanabe Evgeni B. Starikov Koji Noda Manabu Saito |
| Affiliation: | aHigh Energy Accelerator Research Organization (KEK), 1-1Oho, Tsukuba 305-0801, Japan bInstitute for Theoretical Solid-State Physics, University of Karlsruhe, D-76128 Karlsruhe, Germany cDepartment of Accelerator and Medical Physics, National Institute of Radiological Sciences, Anagawa, Chiba 263-8555, Japan dFaculty of Human Environment, Kyoto Prefectural University, Kyoto 606-8522, Japan |
| Abstract: | Electron-cation collisions have been studied for various protonated deoxyoligonucleotide monocations, using an electrostatic storage ring equipped with a merged-electron-beam device. Resonant neutral-particle emissions have been observed at a collision energy of about 4.5 eV for some of them. The resonance parameters depend on DNA base composition and sequence, and the resonances occur only in oligonucleotide monocations with base stacking. The resonance widths increase with oligonucleotide length, but saturate at trimers. Quantum-chemical estimations performed here help explain these results. |
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